The United States Capitol's former columns still stand.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Elevated freight railway turned wildly successful urban park.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

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

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

An endless sea of white conical domes.

Ozymandias’ time-keeping temple.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A terrific purveyor of natural history objects and curios.

This tiny home was originally a narrow alleyway.

The abandoned remains of this once-thriving hotel looms over the city, awaiting an uncertain future.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This small chapel is built of human bones and decorated with a golden skeleton.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Sloth rehabilitation center in the jungle of Costa Rica.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

The Mysterious Witch Bonney, a haunted statue in an old industrial city.

This sandstone mansion was the home of two of Oregon's most important pioneers.