Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

A 140-year-old castle with underground caves hidden in San Francisco.

The final resting place of New Orleans' most famous voodoo priestess.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

An Aztec snake god has taken the material form of an apartment complex.

France's most famous cemetery, with some of its most curious tombs.

Northern Ireland's Brobdingnagian stepping stones.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A crumbling hospital from the 1850s on Roosevelt Island.

The fairy tale castle of the "fairy-tale king."

World's largest collection of serial killer artwork and other macabre exhibits.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

Seven flags adorn this Texas museum, one for each of the powers that have ruled the area.

The petroleum industry brings you the joys of hydrocarbons and largest collection of antique oil rigs in the world.

Remembering the Alamo with a full-scale replica of the 1836 city.

This historical air terminal in Houston is slowly becoming an aviation museum dedicated to the city's aeronautical history.

A Victorian mansion, painstakingly reproduced to appear just as the the Munster's family home did on TV.