In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

A dark Victorian well house now plays host to mystical waters and pagan shrines.

Fascinating town where normal life interfaces with the occult.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

Tens of thousands of ancient rock carvings hidden in the heart of a French national park.

An ever-changing gathering of crude wooden figures haunts the St. Lawrence River.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This chilly Canadian hotel has a four-month lifespan due to the unusual material it's made of.

If they push on just the right spot, even the weakest person can move this titanic boulder.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

A French artist's vague warning hangs over Belleville.

An abandoned beach resort in Normandy reclaimed by artists.

This collection of French root art looks like an indoor fairy wonderland.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

An aluminum skeleton brings Chinese mythology to the French shore.

Beautiful carved tunnels.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.