Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

This ancient theater was once the home of fierce gladiatorial battles.

Natural mummies hidden in the crypt of a medieval French church.

A unique underground structure dating back to the 1st century BC.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

BDSM, 1930s Style.

A chapel on a volcanic core, marking the end of a successful journey.

Statue of a decomposing prince that once held his heart in its hand.

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

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

An icy lake tucked among jaw-dropping alpine panoramas.

This little-known relic crypt holds stolen parts of a Roman Empress.

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

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

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

An aluminum skeleton brings Chinese mythology to the French shore.

An ancient monastery, a locked room, and a mysterious book heist.

A Gothic cathedral created from volcanic rocks.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

Two small chapels housed inside an ancient tree.

The largest underground church in Europe.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.