At 207 feet, one of the world's longest continuous escalators.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

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.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Eighty million natural history specimens call this gargantuan museum home.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

London's smallest police station is barely the size of a phone booth.

Ride the subways of yesteryear.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The site of the climactic scene from the classic horror film is now a historic landmark.

Famously misunderstood wonder of the ancient world

Elevated freight railway turned wildly successful urban park.

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

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

The first American department store, and home to the largest operating musical instrument in the world.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.