This former drainage pumping station was fundamental to the drainage of the Po delta.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

This Gothic revival structure has been a family home, a military base, a gymnastics center, and is now owned by one of the largest auction houses in Italy.

The oldest operating pharmacy in the world features 800-year-old recipes.

These 500-year-old frescoes depict the city in its glory days.

This legendary dive bar boasts a collection of over 1,300 clown figurines.

Indents in the pavement are all that remain from a grisly death machine in Paris.

The oldest stone house in Paris was built by its most famous alchemist.

An ancient cemetery hides behind a line of disparate chapels.

One of the world's largest swinging bells is a symbol made from the melted aftermath of war.

A UNESCO-protected spiritual seat of the Old Serbian Kingdom and Empire.

The castle in the romantic landscape of Podyjí houses what may be Europe's largest collection of taxidermy dogs.

The remnants of a fictional Viking village film set now serve as an educational and historical hotspot.

These unique "earth pyramid" clay columns can be found in ravines around the village of Tirolo.

This monastery set over a holy cave contains the oldest known painting of Saint Francis of Assisi.

Deep in the limestone cliffs of the Alabaster Coast, a German fortress built during World War II.

South of Bologna, a limestone grotto with a protruding waterfall and a floor full of cave pearls.

This cheese shop also houses a museum devoted to Dutch dairy.

The largest underground lake in Europe.

The stones of this formerly witch-obsessed castle were used to build a church.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

A stately castle in the northern Italian countryside has been restored after years of neglect.

This cliff-face port is considered a masterpiece of mining engineering.