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

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Breathtaking and huge 430 year old maps of Italy.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

The bears of Bern have been a city highlight for over 500 years.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

A historic observatory precariously perched at the "Top of Europe."

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Caves famous for the dragon-slaying saint who lived there.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.