An emerald-green grotto just a short trip from Austin.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

Ruins of a once-opulent grand Victorian resort.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

One extremely determined man's homemade universe.

The center of the only hemisphere that awards visitors with a commemorative coin.