This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

The only diamond mine in the world where you can keep what you find.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Fantastic lake on the heart of a fault line.

Large miniature theme park with 100-plus models.

A Turkish ghost town abandoned in a population exchange with Greece.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A city built from mud and known as the "Manhattan of the desert."

This abandoned Brutalist treehouse is a hidden architectural relic.

A Bhutanese temple gifted from the isolated Himalayan kingdom is now a surprising cultural gem located at the University of Texas at El Paso.

The house's confection-like decorations are the result of one man's painstaking work over decades.

A view-altering observatory at the University of Texas.

This eclectic, mosaic-clad home includes a bamboo ping-pong loft and a "Whispermaphones" intercom.

Beauty and history abound in this remote West Texas canyon.

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

Foragers once flocked to this big beautiful bayou to hunt for pearls.

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

An unrealized Taoist palace left abandoned in a Houston suburb.

A medieval castle in the middle of rural Texas.

Twenty churches beautifully painted by 19th-century Czech and German immigrants in Texas.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

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