Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

Many famous English poets including Elizabeth Barrett Browning are laid to rest at this Swiss-owned cemetery in Florence.

These pools have been abandoned for over 20 years.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

A map of Italy made entirely of trees.

A dead saint, a deadly poison, and a mysterious holy ooze.

The oldest volcanology research center in the world.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

The walls and streets of the ancient city are peppered with penises.

The steel cable lets adventurers zoom between two mountain towns at speeds of up to 75 miles per hour.

During World War II, this rice mill became a Nazi concentration camp.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Ancient ruins hidden underneath a modern luxury hotel.

Macabre symbols of death and mummies on display set the tone of this Italian purgatory church.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

Fountain where visitors can earn a license to be mad.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.