A grotto is a group of cavers, who are usually members of the National Speleological Society (NSS).

In many parts of the country, these members have formed local grottos or chapters and regional organizations. These groups sponsor trips, offer training, teach and practice cave conservation, and provide a framework for studying caves. Most grottos will welcome new members who are interested in caves and committed to cave conservation.

Loyalhanna Grotto Inc. of the NSS meets on the first Wednesday of every month, 7pm, at the Monroeville library, 4000 Gateway Campus Blvd, Monroeville, PA 15146