A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The state bird of New Mexico, constructed entirely out of garbage.

This bird-shaped rock formation defies gravity, time, and classification.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

The remains of a historic ranch house that witnessed the Civil War battle dubbed the “Gettysburg of the West.”

The most powerful laboratory radiation source in the world pulses with 1,000 times the electricity of a lightning bolt.

A clear blue swimming hole with hidden caves, still unexplored.

These aggressively sustainable art homes look like something out of 1970's science fiction.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The shattered remnants of a meteor that struck Santa Fe more than a billion years ago.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Museum devoted to the artificial language of Esperanto.

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

A silly medieval mural preserved on the side of a Viennese house.

Baroque celebration of the end of the Great Plague of Vienna.

Legends surround an ancient tree trunk riddled with nails for good luck.

Op-art architecture designed for happiness.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.