Strange masks and obscure costumes are housed in this old Madrid corrala.

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

Life-size bronzes of the Grinch, Cat in the Hat, Yertle the Turtle, Sam-I-Am, and the Lorax—and the author himself.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.

Ice cream stand, snack bar, and time capsule of milk conveyance.

Narrowest house in Boston.

Museum dedicated to awful artwork.

Shelves covered in dozens of coffee bean varieties fill this North End institution.

A mysterious echo seems to defy the laws of acoustics.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The final resting place of the great navigator, or maybe his brother.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This lucky bronze frog was gifted to Madrid by a casino.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.