This Colorado hiking trail provides a small gold mine of abandoned gold mines.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Scale replica of China's ancient terracotta tomb warriors and Forbidden City are the side project of an eccentric millionaire.

An exquisite grouping of structures made from 10 tons of invasive saplings.

This simple frog painting created by musician Daniel Johnston embodies the spirit of Austin.

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

Giant heads occasionally litter the industrial Houston neighborhood where sculptor David Adickes has his studio.

A wacky, UFO-shaped house in a suburban neighborhood.

This unique tower has been home to malaria-fighting bats for 100 years.

This tiny, hurricane-resistant house in Galveston is one of the city's most notable architectural oddities.

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

This old abandoned sign flickers to announce a motel that isn't even there.

A little bit Wonkatania, a little bit pink elephant.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

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

Minimalist modern art on a repurposed military base in rural Texas.

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

The Grand Canyon of Texas.

Mysterious glowing orbs float through the desert night.

A modernist landscape of water and sci-fi concrete.

These jagged limestone blades cut out through the canopy of the jungles of Borneo.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."