The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

England’s ancient oak tree has such an impressive girth, people have been hosting parties within the hollow trunk for centuries.

One of the oldest libraries in England, and one of the last of the great medieval chained collections.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

A magnificent mansion hides a delightful collection of historic timepieces.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

These "anatomical machines" are only one of the many strange items in this Italian crypt.

The final resting place of the poets Shelley and Keats.

The largest and most famous wax anatomical collection anywhere in the world.

A submerged archeological park still holds the wonders of a Roman Sodom.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A unique waterfall that some believe attracts the fairfolk.