A seemingly endless landscape of pure salt stretches far across Bolivia.

Romania's only crater lake with water as pure as if distilled.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The topiary maze at the Habsburg hunting lodge.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

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

In the hinterlands of Serbia's capital, a giant reflective mushroom houses an aeronautical history of the former Yugoslav republic.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Just a few miles from Novalja, a strange geological oddity has left scientists baffled.

The only gulag ever to exist in socialist Yugoslavia.

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

Longest fortress system anywhere in Europe.

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

Yugoslavia's biggest underground airport lies in ruins.

An ethereal glowing blue ocean cave in Croatia.