The little-known final resting place of one of America's greatest writers.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

Elevated freight railway turned wildly successful urban park.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

Khmer Rouge's high security prison.

A battle between nature and architecture in the Cambodian jungle.

5,000 skulls in memorial to those killed by the Khmer Rouge.

The spot where the two men ate together now stands enclosed in glass.

Life-sized painted illusions let pedestrians blend in with the street art.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

Monument to a brutal, ineffectual US bombing campaign and a sobering reminder of the human cost of the Vietnam War.

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

It was once the base for a series of domestic terror attacks.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Before Nixon, "watergate" meant canals.

The national park was once a plantation estate.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

This fantastical waterfall is hidden in a cave located in a cracked cliff.