Swedish skyscraper with a 90° twist.

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

Copenhagen's celebrated theme park and gardens.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

The home of aviation trailblazers, in a remote corner of the big city.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

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

Hear the tales of New York's most notorious criminals.

One kilometer of thick brass rod laid out before your eyes.

Norway's national monument to fallen seamen.

One of the most remote and isolated villages on the Arabian Peninsula.

A city built from mud and known as the "Manhattan of the desert."

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

A 550-square-meter micro-nation off the coast of Britain.

Surreal riveted sea forts once protected the Kent shores from German attack.

The largest of London's subterranean rivers and once a mad, bad center of London life.