One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Yugoslavia's biggest underground airport lies in ruins.

Humble beginnings for one of the world's most famous scientists.

The remains of a Canadian train crash are now mouldering beneath layers of rust and graffiti.