This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

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

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Britain's only herd of free-ranging reindeer.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

A sea cave with a waterfall and Viking past

This single-track road rewards brave drivers with stunning Scottish scenery.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A close look reveals that the Scottish monument is just slightly off-kilter.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

Elevated freight railway turned wildly successful urban park.

A terrific purveyor of natural history objects and curios.

An abandoned shipping control tower looks like a satellite perched at the end of a pier.

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

A museum dedicated to the tragedy of Bloody Sunday.