{"id":39881,"date":"2026-06-05T02:18:46","date_gmt":"2026-06-05T02:18:46","guid":{"rendered":"https:\/\/www.karst.org\/?post_type=product&#038;p=39881"},"modified":"2026-06-06T03:25:22","modified_gmt":"2026-06-06T03:25:22","slug":"lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania","status":"publish","type":"product","link":"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/","title":{"rendered":"PENNSYLVANIA: Lincoln Caverns &#038; Whisper Rocks Huntingdon County Pennsylvania"},"content":{"rendered":"<p>Jack H. Speece and owner Ann Dunlavy tell the fascinating history of Lincoln Caverns, originally Hi-Way-May Caverns and William Penn Caverns, discovered when Route 22, the William Penn Highway, was being constructed. This beautifully-operated show cave and its companion cave, Whisper Rocks, are detailed in photos and grapics in this 44-page booklet.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jack H. Speece and owner Ann Dunlavy tell the fascinating history of Lincoln Caverns, originally Hi-Way-May Caverns and William Penn Caverns, discovered when Route 22, the William Penn Highway, was being constructed. This beautifully-operated show cave and its companion cave, Whisper Rocks, are detailed in photos and grapics in this 44-page booklet.<\/p>\n","protected":false},"featured_media":39882,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[94],"product_tag":[],"class_list":["post-39881","product","type-product","status-publish","has-post-thumbnail","product_cat-speece-productions-history-booklets","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PENNSYLVANIA: Lincoln Caverns &amp; Whisper Rocks Huntingdon County Pennsylvania - Mid-Atlantic Karst Conservancy, Inc.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PENNSYLVANIA: Lincoln Caverns &amp; Whisper Rocks Huntingdon County Pennsylvania - Mid-Atlantic Karst Conservancy, Inc.\" \/>\n<meta property=\"og:description\" content=\"Jack H. Speece and owner Ann Dunlavy tell the fascinating history of Lincoln Caverns, originally Hi-Way-May Caverns and William Penn Caverns, discovered when Route 22, the William Penn Highway, was being constructed. This beautifully-operated show cave and its companion cave, Whisper Rocks, are detailed in photos and grapics in this 44-page booklet.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/\" \/>\n<meta property=\"og:site_name\" content=\"Mid-Atlantic Karst Conservancy, Inc.\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-06T03:25:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.karst.org\/wp-content\/uploads\/2026\/06\/2026-06-04-22.09.49-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"2560\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.karst.org\\\/index.php\\\/product\\\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\\\/\",\"url\":\"https:\\\/\\\/www.karst.org\\\/index.php\\\/product\\\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\\\/\",\"name\":\"PENNSYLVANIA: Lincoln Caverns & Whisper Rocks Huntingdon County Pennsylvania - Mid-Atlantic Karst Conservancy, Inc.\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.karst.org\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.karst.org\\\/index.php\\\/product\\\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.karst.org\\\/index.php\\\/product\\\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.karst.org\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/2026-06-04-22.09.49-scaled.jpg\",\"datePublished\":\"2026-06-05T02:18:46+00:00\",\"dateModified\":\"2026-06-06T03:25:22+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.karst.org\\\/index.php\\\/product\\\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.karst.org\\\/index.php\\\/product\\\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.karst.org\\\/index.php\\\/product\\\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.karst.org\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/2026-06-04-22.09.49-scaled.jpg\",\"contentUrl\":\"https:\\\/\\\/www.karst.org\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/2026-06-04-22.09.49-scaled.jpg\",\"width\":1920,\"height\":2560},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.karst.org\\\/index.php\\\/product\\\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.karst.org\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Store\",\"item\":\"https:\\\/\\\/www.karst.org\\\/index.php\\\/store\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"PENNSYLVANIA: Lincoln Caverns &#038; Whisper Rocks Huntingdon County Pennsylvania\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.karst.org\\\/#website\",\"url\":\"https:\\\/\\\/www.karst.org\\\/\",\"name\":\"Mid-Atlantic Karst Conservancy, Inc.\",\"description\":\"Preserving the Caves of Today for the Cavers of Tomorrow\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.karst.org\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.karst.org\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.karst.org\\\/#organization\",\"name\":\"Mid-Atlantic Karst Conservancy, Inc.\",\"url\":\"https:\\\/\\\/www.karst.org\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.karst.org\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.karst.org\\\/wp-content\\\/uploads\\\/2019\\\/05\\\/cropped-MAKC-Logo-300-pix-1.jpg\",\"contentUrl\":\"https:\\\/\\\/www.karst.org\\\/wp-content\\\/uploads\\\/2019\\\/05\\\/cropped-MAKC-Logo-300-pix-1.jpg\",\"width\":78,\"height\":45,\"caption\":\"Mid-Atlantic Karst Conservancy, Inc.\"},\"image\":{\"@id\":\"https:\\\/\\\/www.karst.org\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"PENNSYLVANIA: Lincoln Caverns & Whisper Rocks Huntingdon County Pennsylvania - Mid-Atlantic Karst Conservancy, Inc.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/","og_locale":"en_US","og_type":"article","og_title":"PENNSYLVANIA: Lincoln Caverns & Whisper Rocks Huntingdon County Pennsylvania - Mid-Atlantic Karst Conservancy, Inc.","og_description":"Jack H. Speece and owner Ann Dunlavy tell the fascinating history of Lincoln Caverns, originally Hi-Way-May Caverns and William Penn Caverns, discovered when Route 22, the William Penn Highway, was being constructed. This beautifully-operated show cave and its companion cave, Whisper Rocks, are detailed in photos and grapics in this 44-page booklet.","og_url":"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/","og_site_name":"Mid-Atlantic Karst Conservancy, Inc.","article_modified_time":"2026-06-06T03:25:22+00:00","og_image":[{"width":1920,"height":2560,"url":"https:\/\/www.karst.org\/wp-content\/uploads\/2026\/06\/2026-06-04-22.09.49-scaled.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/","url":"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/","name":"PENNSYLVANIA: Lincoln Caverns & Whisper Rocks Huntingdon County Pennsylvania - Mid-Atlantic Karst Conservancy, Inc.","isPartOf":{"@id":"https:\/\/www.karst.org\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/#primaryimage"},"image":{"@id":"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/#primaryimage"},"thumbnailUrl":"https:\/\/www.karst.org\/wp-content\/uploads\/2026\/06\/2026-06-04-22.09.49-scaled.jpg","datePublished":"2026-06-05T02:18:46+00:00","dateModified":"2026-06-06T03:25:22+00:00","breadcrumb":{"@id":"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/#primaryimage","url":"https:\/\/www.karst.org\/wp-content\/uploads\/2026\/06\/2026-06-04-22.09.49-scaled.jpg","contentUrl":"https:\/\/www.karst.org\/wp-content\/uploads\/2026\/06\/2026-06-04-22.09.49-scaled.jpg","width":1920,"height":2560},{"@type":"BreadcrumbList","@id":"https:\/\/www.karst.org\/index.php\/product\/lincoln-caverns-whisper-rocks-huntingdon-county-pennsylvania\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.karst.org\/"},{"@type":"ListItem","position":2,"name":"Store","item":"https:\/\/www.karst.org\/index.php\/store\/"},{"@type":"ListItem","position":3,"name":"PENNSYLVANIA: Lincoln Caverns &#038; Whisper Rocks Huntingdon County Pennsylvania"}]},{"@type":"WebSite","@id":"https:\/\/www.karst.org\/#website","url":"https:\/\/www.karst.org\/","name":"Mid-Atlantic Karst Conservancy, Inc.","description":"Preserving the Caves of Today for the Cavers of Tomorrow","publisher":{"@id":"https:\/\/www.karst.org\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.karst.org\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.karst.org\/#organization","name":"Mid-Atlantic Karst Conservancy, Inc.","url":"https:\/\/www.karst.org\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.karst.org\/#\/schema\/logo\/image\/","url":"https:\/\/www.karst.org\/wp-content\/uploads\/2019\/05\/cropped-MAKC-Logo-300-pix-1.jpg","contentUrl":"https:\/\/www.karst.org\/wp-content\/uploads\/2019\/05\/cropped-MAKC-Logo-300-pix-1.jpg","width":78,"height":45,"caption":"Mid-Atlantic Karst Conservancy, Inc."},"image":{"@id":"https:\/\/www.karst.org\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/www.karst.org\/index.php\/wp-json\/wp\/v2\/product\/39881","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.karst.org\/index.php\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.karst.org\/index.php\/wp-json\/wp\/v2\/types\/product"}],"version-history":[{"count":2,"href":"https:\/\/www.karst.org\/index.php\/wp-json\/wp\/v2\/product\/39881\/revisions"}],"predecessor-version":[{"id":39918,"href":"https:\/\/www.karst.org\/index.php\/wp-json\/wp\/v2\/product\/39881\/revisions\/39918"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.karst.org\/index.php\/wp-json\/wp\/v2\/media\/39882"}],"wp:attachment":[{"href":"https:\/\/www.karst.org\/index.php\/wp-json\/wp\/v2\/media?parent=39881"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.karst.org\/index.php\/wp-json\/wp\/v2\/product_brand?post=39881"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.karst.org\/index.php\/wp-json\/wp\/v2\/product_cat?post=39881"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.karst.org\/index.php\/wp-json\/wp\/v2\/product_tag?post=39881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}