This sculpture forces visitors to confront their relationship with space.

This unique library spans a mighty river.

This large artificial waterfall in Washington state was merely an incidental byproduct of a technological megaproject.

With its vaulted ceiling and gilded details, this University of Washington library would feel right at home inside an old palace.

An eclectic collection of wind-powered sculptures made from found and recycled materials.

A serene temple with stunning stained glass hides in downtown Dallas.

A taste of Middle Earth, in the middle of the Bayou City.

The 19th-century ruins hide deep in an overgrown forest.

A shrine to the royal lord of all cacti.

The oldest functional consecrated church on Mustang Island.

This small stone building, the final work of a renowned artist, offers a peaceful environment with radiant, colorful glass windows .

On the outskirts of San Antonio, a small bridge is said to be the home of a mysterious local legend known as the "Donkey Lady."

Known as one of America's most beautiful public restrooms.

This lake sits on an estimated 4 million tons of salt.

A dam that moonlights as a gigantic, brutalist waterslide.

Fears of Satanic worshippers swirl around five Celtic-inspired megaliths.

The largest underground pedestrian tunnel system in the U.S. mostly caters to the people working in the offices above, but provides a great, air-conditioned way to traverse the city.

An immense cave that has served as an outlaw's treasure trove, an underground dance hall, a nuclear fallout shelter, and much more.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

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.

An out-of-the-way state park in Oregon that features both a picturesque waterfall and the ruins of a hydropower plant.

Get your cosplay on at Portland’s only Medieval fantasy-themed mead hall.