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.

This small Bavarian graveyard is filled with empty graves for German soldiers lost during the World Wars.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

Tour the luxe "glass cage" that inspired and unnerved the architecture world upon its debut.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

Tucked away amongst townhomes lies a restored, early 20th-century tea house and garden, the only remains of a historic estate.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

These spartan apartments are provided to clergymen visiting Vatican City.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Giant, friendly pelicans in Central London, the most unlikely of places.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

One of the shortest streets in York has an especially odd name.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

World's second largest particle accelerator, where nature reveals its secrets.