Close up view of gypsum crusts in a lava tube in Lanzarote ... This discovery indicates microbial activity and microorganisms ...

Carlsbad Caverns National Park in southeastern New Mexico is home to 119 known caves, including North America's largest cave chamber, the Big Room.

This serial property is an unusually well-preserved and extensive epigenic gypsum karst terrain. It includes a very high density of caves: over 900 caves in a relatively small area, with over 100 km ...

Optymistychna Cave This cave is listed in the Guinness Book of Records as the largest gypsum cave and the second-longest in terms of total length of cave passages. It is located on the western ...

First Amendment: Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the ...