Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Copenhagen's celebrated theme park and gardens.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A crumbling hospital from the 1850s on Roosevelt Island.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

An enormous, inside-out glass globe built in 1935.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

The legendary building that needed ghostly approval before being built.

Most-visited and most-photographed slot canyon in the American Southwest.

The most loyal of little dogs, or a Victorian era publicity stunt?

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The longest burning light bulb in the world.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Become a prohibition rebel.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Elevated freight railway turned wildly successful urban park.

The most confusing clock in New York.

An artist's cute bronze subway sculptures belie his violent artistic past.

Red frames showcase remnants of one of New York's original subway stations.