One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Commonly acknowledged as the only public monument to the Devil himself.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

After the queen of Spain had a dream where these statues fell and crushed her, they were removed from the palace and given new homes around Madrid.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

This free, take-a-book shop seems like a trick but isn't.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

One of the best examples of a Byzantine period monument in Albania.

The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

This church was transported brick by brick from the ruins of a 16th-century city into Panama City's current historic district.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

Where Saint-Martin ends and Sint Maarten begins (or vice versa).

According to local history, this cast-iron canine was nearly melted down for bullets during the Civil War.

Rumors persist that a bottle of whiskey is sealed within this Demijohn-shaped adornment.

A few times a day, you can see an animatronic cowboy shoot-out.

A full-size replica of this well-preserved temple lets you take a walk through the Mayan age.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.