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

A 16th-century Andalusian palace.

The world's largest wooden structure.

Giant topiary dog once played a role in a terrorist bomb plot.

Legends surround this natural rock formation that looks like a Moorish king wearing a crown.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

The world's only museum devoted to the wonders of fluorescence.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

The largest collection of handbags in the world, the oldest of which were used to carry Bibles, primarily by men.

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

A garden in Lisbon filled with giant porcelain creatures.

A micronation on an islet along the coast of a Portuguese island.

This shrine to bovine consumption and all things fast food is a slice of culinary history both rare and well done.

The island residents are known for taking their quirky sense of humor with them to the grave.

Over 120,000 curious objects that have shaped our modern world.

Former villa and estate of James Deering developed to preserve native tropical forests.

A monument celebrating the idea of reaching inaccessible places.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

After Christopher Columbus died, his son built a fancy house to rule from.

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.