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

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

An ancient capital city that dates back 3,000 years and harbors many surprises.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A unique seaside cave where Aleister Crowley faked his own death.

The modern birthplace of Irish freedom.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

Oriental bazaar in the heart of Sarajevo.

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

Bridge that died in war and was resurected.

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

Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A pair of connected skyscrapers form this symbolic gateway.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The oldest wind turbine in Europe, constructed by a group of friends in 1932.

Brought to you by the makers of fiberglass dinosaurs.

Real bones which are said to have belonged to a Polish dragon.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

A statue honors the children who fought Nazis in Poland.