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

Old Danish castle immortalized in Shakespeare's Hamlet.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Regency-era excess on the English Coast.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

Go surfing on this urban wave, "hacked" by local surfers.

A unique bridge with an equally unique view.

The fairy tale castle of the "fairy-tale king."

Bell tower juts out from a village buried under a lake.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

One man’s passion for gas stations is on display along the Rio Grande in northern New Mexico.

A natural formation that resembles a camel resting in the New Mexico desert.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The "lovely red Vega" of the legendary record-settling pilot.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.