An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

Remnants of the Nazis' occupation of Denmark linger along the sand.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

You can row a boat through this ancient underground reservoir.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Apartment complexes built into huge repurposed natural gas tanks.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

An unusual sand beach in the middle of a forest.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

This otherworldly French waterfall looks like its waters have turned to stone.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

A bike train runs along a disused railway line through the tranquil French countryside.

An abandoned beach resort in Normandy reclaimed by artists.

This is what trains will look like after the zombie apocalypse.

Sleep in a climate-controlled plastic bubble for the night.

An aluminum skeleton brings Chinese mythology to the French shore.

The haunting concrete remains of a Nazi pebble crusher can still be found in this small French commune.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.