"The prettiest love letters in the world" ... or so said Lord Byron.

Ancient ruins hidden underneath a modern luxury hotel.

Anatomical cabinet holds unexpected treasures.

A domed disco abandoned since the '70s now attracts artists and explorers under its unique roof.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

The giant skeleton sculpture is surprisingly well-traveled.

Italian cave with exceptional acoustics and an unsavory history.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Armenian monks at an island monastery in the Venetian Lagoon make a rare rose petal jam.

Erotic art covers the walls of the largest ancient pleasure palace.

A forgotten "city of water" underneath the famous Trevi district.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

Medieval torture techniques with a modern conscience.

This large, circular tomb is the final resting place of the first emperor of Rome.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

A sunken idol welcomes parishioners to Davy Jones' Locker.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.