In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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.

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

Fortified medieval tower house with lovely roof garden.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Beautiful views and Roman-style statues on the Italian coast.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Virgil's many-mouthed gateway to the underworld.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

The World's First 24 Hour Coin-Operated Art Gallery!! Plastic, Styrofoam, and Elvis--If you can't get rid of it, you might as well worship it!!

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

Tiny horses tethered to antique rings are scattered around the city.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

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

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

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

This public art piece proves that in Portland even reporting the weather is a thing of whimsy.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.