A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The most decorated dog of World War I is preserved in the Smithsonian.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The highest tides in the world come in and out here twice a day, allowing you to essentially walk along the ocean floor.

The oldest hall in Iceland was written of in the Sagas and features a centuries-old escape tunnel.

The oldest church in Iceland is one of the few to feature ornate decoration.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Among the busts of heroes of the Roman Republic of 1849, there is also a statue of a boy and his dog.

Climb the dead electric pylons of Messina.

The Italian revolutionary's legendary wife is portrayed on horseback waving a gun and holding her child in this memorial on the Janiculum.

This medieval city gate is now a blend of the past and the modern world.

Buried next to Pompeii, this lesser-known Roman villa was the opulent vacation home of Emperor Nero's wife.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

Where Venice's gondolas go for a tune-up.

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.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

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

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The walls and streets of the ancient city are peppered with penises.

A young Italian couple has been locked in an embrace for over 6,000 years.

This ancient market is often referred to as the oldest shopping mall in the world.

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