A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

A fantastic castle rumored to be the birthplace of King Arthur.

The largest catacomb system in the world.

This attraction was abandoned after the Chernobyl disaster.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Explore the subjective dream of a hotel.

At 929 pounds and 26 feet tall, this stainless steel fork can only be used by the likes of King Kong.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

Frequent fliers welcome in this airplane hotel.

The highest peak in mainland Spain is said to be the final resting place of a Muslim king.

An independent naturist colony amidst 1000-year-old ruins.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This 47-story "M" needed 20 years to be completed

This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

A darkly erotic open-air statuary in Catalonia.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

This semi-secret storybook hedge maze is also the oldest garden in the city.