A grove of colossal man-made flowers built to collect the sun's rays.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

A popular swimming hole that hides one of America's most deadly diving spots.

A modernist landscape of water and sci-fi concrete.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

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

Megachurch turned Catholic church comprised of 10,000 glass panes.

The site of murders and Satanic cult gatherings.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

America's most famous piece of self-built architecture.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.