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

The world's largest collection of witchcraft regalia.

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

The sign at the garden gate reads: "These Plants Can Kill."

Hidden beneath the streets of London is a secret subway that only carried mail.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

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

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Harlequin costumes, signed scripts, and armor-wearing puppets.

The tomb of the mythological founder of Padua is not hidden in some obscure crypt, but stands right in the middle of the city square.

Ever hear of the Milazzo Cage?

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

With its mine closed, this old village is starting to resemble a ghost town.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

An abandoned building that once tightened a power line that stretched across Messina Strait.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

An abandoned shopping gallery built during Fascist Italy tucked in the center of Palermo.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.