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

The "Prussian Versailles" that is as glorious today as when it was built.

Started as a kitchen garden, now the second largest botanical garden in the world.

Two stone columns flank the grand Venice square, but there were supposed to be three.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

This Dalecarlian horse is about the size of a pinhead.

The nearly 200-year-old building displays a perplexing grammatical error.

A ruined Maya city that suffered a years-long case of mistaken identity.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

The remains of Alfred Nobel's first nitroglycerine factory can still be found on the shores of a Swedish bay.

Enter the cabin of a life-sized Hindenburg replica.