This ruined castle perched atop a rocky peak is a great place for a hike.

Before serving as James Bond's Casino Royale, this Victorian-era spa catered to the world's elite.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

Looming communist pillar with a Czech twist.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This former quarry is now a picturesque gorge that hides a sunken lake.

A spiral staircase twists to the top of this unusual Czech lookout tower.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

The first museum in the world devoted to sexual gadgetry.