Italian cave with exceptional acoustics and an unsavory history.

142 ceramic steps become a mosaic once a year.

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

A madman's personal garden filled with 1,000 sculpted heads.

Tourists to the mountaintop Sicilian town often overlook its ancient fortifications.

During the heyday of fishing in Hastings, there were more than 100 of these storage facilities.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

The sanctuary seems to either float atop the water or sink into the dirt, depending on the water level.

An unusual stone chair can be found on the banks of the River Wear, not far from Durham Cathedral.

Old Tudor home moved on thick iron rails to a new spot.

Isambard Kingdom Brunel, one of the great Victorian engineers, was the driving force behind the short-lived atmospheric railway.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

Locals call it the "Give Peas a Chance" bridge because of its distinct graffiti.

A historic arboretum and non-conformist, non-denominational park cemetery.

London's Victorian Tower of Babel.

This medieval church tower has maintained its clockworks since the 16th century.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This lonely cast-iron structure is the only wave-washed lighthouse of its kind left in all of Britain.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

This medieval castle was reconstructed by Carlo Scarpa.

One of London's oldest houses contains a mixture of both old and modern features.

This peaceful oasis appears dreamy, but it's also the site of a nightmarish legend.

A monument with a strange legend involving a horse's tongue.

Hundreds of years ago, this lion-shaped door knocker could help a person accused of a crime find temporary safe haven in Durham Cathedral.