Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

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

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Looming communist pillar with a Czech twist.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Macabre astrological automaton clock dating to the late 1400s.

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.

A rare permanent monument to the Scottish Travellers.

An eccentric aristocrat brought these Australian natives to their current Scottish home.

An intricately carved Viking church overlooks a glistening fjord.

This Scottish bridge seems to compel dogs to leap to their death.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.