This Czech military museum is home to pink tank that was once a symbol of art and political rebellion.

The majority of the highest mountain in Poland is actually located in a different country.

A breathtaking viewing platform over the Alps.

Former military fort and site of untold horrors during WWII, this island may become the Adriatic's next luxury resort.

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

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

Now abandoned, the world's first torpedo factory is crumbling into the sea.

This narrow fjord-like bay is the largest ria in the Mediterranean Sea.

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

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

The remains of an entire Roman city can be explored in this interactive museum.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

The abandoned military base looks like a post-apocalyptic wasteland.

This massive subterranean fissure is known as the "underground Grand Canyon."

The skulls and bones of thousands of soldiers line the walls of this small Italian chapel.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

These elaborate gothic monuments honor Verona's medieval lords.

The walls of this tiny Italian church are entirely covered with frescoes.

The secret medieval communication system will whisk your words above the noise of the crowd.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

An icy lake tucked among jaw-dropping alpine panoramas.

A series of haunting wooden totems are hidden in the woods surrounding a German environmental center.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.