Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

This unique structure allowed boats to bypass underwater mine barriers in the channel to enter the harbor.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

This 135-year-old weather station studied the effects of the climate on human health.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

Where the lovelorn find a home for their sentimental keepsakes.

A musical instrument played by the sea.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

The underground sanctuary of a mysterious ancient cult.