A dreamy mausoleum honors Persia's most famous poet.

This slowly crumbling mansion was home to one of East Africa's richest and most powerful slave traders.

This rare volcano spews the strangest and (literally) coolest lava in the world.

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

On the Hudson resides one of the largest clocks in the world.

Once considered a marvel of engineering, this 107-mile canal played an integral role in building New York City.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

An early 20th-century bullring converted into a modern shopping center.

An ancient iron pillar in Delhi that seems to be rustproof.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

If you ever wanted to touch a medieval mercenary’s three testicles, look no further.

A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

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

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

The first mosque in the world to receive electricity.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

Oriental bazaar in the heart of Sarajevo.

The place where World War I began.

This historic cemetery was inaccessible for several years due to dozens of land mines.

Bridge that died in war and was resurected.