Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

Cold war icon and onetime "hole" in the iron curtain.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

A kindergarten shaped like a cat with a tail that's a slide.

A century-long search for a church that was never there.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

Fantastic views and thousands of love locks.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Yugoslavia's biggest underground airport lies in ruins.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

These warring psychedelic crags commemorate an unsuccessful military operation.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

The remains of the last Bosnian fortress to fall to the Ottomans are still standing.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

This historic cemetery was inaccessible for several years due to dozens of land mines.

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

Place with alleged mystical powers in Old Orthodox Church in Sarajevo.

A war-torn Olympic relic is being overtaken by graffiti and nature.

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

This giant temperature attraction created some giant electric bills.

Home to the deepest rift anywhere on Earth.

The oldest continuously operating church in California.

The stately birthplace of California's statehood.