Italian cave with exceptional acoustics and an unsavory history.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Geothermal waterfalls in Tuscany.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

The Netherlands' first car tunnel has an unusually rectangular shape.

Atop this former dutch railway office sits an interstellar work of art.

Building Men of War and Indiamen from Holland's Golden Age.

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

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.

A dramatic art installation features a BMW flying out of a building in Rotterdam.

The last of Amsterdam's original sea level markers remaining in place.

Remarkably preserved body discovered in a peat bog.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Go inside a revolutionary, cage-less zoo where 35 species live and some of them roam free alongside their human visitors.

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

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

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

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

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.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.