A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

Europe's second largest ossuary wasn't discovered until 2001.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

This strange statue depicts a young boy's body with an adult Mozart's head and a single wing.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

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

A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

A beautiful mountaintop mausoleum devoted to a Montenegrin icon can't seem to make everyone happy.

A curious cave church carved into the face of a cliff.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

The oldest preserved Triumphal Arch in Northern Italy

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

Engineering ingenuity during the battle of Gibraltar.

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.

The largest camel market in West Africa

Northern Europe’s largest castle ruins sit precariously on an island cliffside.