A psychedelic labyrinth on the San Francisco bay.

A winding path built in secret on the edge of the continent.

The NBA player's elaborate former home is now a ghost of its old glory.

A trio of giant megalithic stones in the middle of a golf course.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

This tangled English forest looks like something right out of a fairytale.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

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

A mysterious Neolithic tomb is perched along the edge of a modern golf course.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A good place to research the Freemasons, esoterica, occultism, and hermeticism.

A once-secret library of Freemason history in Catalonia.

Huge masonic hall in Philadelphia with lavishly themed rooms.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

Ancient Bronze Age rampart that was used into the middle ages.

A stone wall that mysteriously moved three feet from its foundation.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

Petrified footprints of one of the very first vertebrates to walk on land.