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

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

Fortified medieval tower house with lovely roof garden.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Climb inside an iron crystal magnified 165 billion times its normal size.

It houses the remains of a 17th-century version of the Titanic.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Maine’s only official memorial to the Underground Railroad.

Abraham Lincoln's vice president took his last breath here on July 4, 1891.

The eccentric mansion of one the most popular horror authors of modern times.

The second-oldest garden cemetery in the U.S. was also a college brainstorm spot of Stephen King.

This handsome giant is said to mark the birthplace of the mythical woodsman and even had a cameo in a Stephen King novel.