Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

The United Kingdom's smallest working cathedral also serves as a quaint bed and breakfast.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A very classy 1920s-era bar right in Grand Central Station.

New York City's smallest piece of private property.

One of only two commuter aerial tramways in the United States.

Sniff the Titan Arum's rotting flesh.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

Ride the subways of yesteryear.

A dilapidated dock tells the story of Titanic's missed arrival.

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

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

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

The world's oldest surviving music hall was also once a freakshow.

Built to hold the worst of the worst of the Nazi war prisoners.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

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

A psychedelic labyrinth on the San Francisco bay.