Carlsbad Caverns National Park, NM - UNESCO World Heritage Site

 Place: Carlsbad Caverns National Park, NM

Weather: Sunny, 65/93F

Route: From San Antonio 462 miles WNW on I-10 W, US-285 N.

Significance: There are more than 100 limestone caves within the park - each with a variety of rock formations. There are 18 feet long "chandeliers" and huge rooms reminiscent of cathedrals. 

Websites: UNESCO World Heritage Sites, National Park Service.

Images: 

One of the big rooms (from audobon.org)

Main entrance to the caves (from travelandleisure.com)