A semi-scholarly approach to sex.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Lie in a hammock where George Washington stood.

Elevated freight railway turned wildly successful urban park.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

Salute the leader of the proletariat.

A terrific purveyor of natural history objects and curios.

Unrepaired walls from a 1920 anarchist bomb attack.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Avoid gangster interaction while window-shopping.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Museum preserving torture methods from the past.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Experience a charming 1930's version of "infotainment."

One man's attempt to create an artistic wonder on a run-down block in Detroit.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

Medicinal spa created with the discharge from a geothermal energy plant.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

A battle between nature and architecture in the Cambodian jungle.

Khmer Rouge's high security prison.

World's first "penitentiary," meant to be humane, drove men insane.