A monument at Alicante Marina honors a little-known hero of the Spanish Civil War.

This ancient fort has been a great insight into the Roman presence in the region.

This 47-story "M" needed 20 years to be completed

The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

A public work of art that also provides some relief from the summer heat.

A whimsical bridge adorned with decorative dragons.

Where the lovelorn find a home for their sentimental keepsakes.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.

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

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

The ruins of a megalithic monument sit right in the garden of a luxurious Maltese resort.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This statue honors the thousands of Allied avians that served and died for France during World War I.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

Amsterdam's former hotspot for public executions and dissections.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

While most bridges allow roads to pass over water, this one allows water to pass over a road.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

This large sand dune in the Netherlands is home to wind-whipped trees with "floating" roots.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

This historical Netherlands fortress still bears the marks of its single siege.

The tallest mountain in mainland Netherlands isn't actually very tall.

A beautiful maze marks where three countries meet.

Brussels' favorite peeing boy has a sister.