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An underground city of salt.

The former headquarters of history's oldest megacorporation.

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

The 20-mile causeway that separates the Netherlands from the sea.

Yup, that's a 330-foot yacht passing over the highway.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

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

A grassy pyramid named after a French battle.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

A beautiful maze marks where three countries meet.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

The Adriatic's most famous wind can be reliably experienced in the city's Marina.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

Ham is serious business at the Prosciutto Museum-Serious, delicious business.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

The glowing blue Nymphaeum of Emperor Tiberius.

Single runway interrupted by a busy road that cuts across its middle.