A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

Stone pillars and a petrified wedding party in the hills of North Macedonia.

Each year melting snow turns these Austrian hiking trails into scuba zones.

A German apartment building hosting as many trees as human occupants.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

This former steel and coal plant is now a neon-lit industrial fantasia.

An industrial relic is now one of Europe's most staggering art spaces.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

This strange building looks like a medieval fortress crashed into a 1960s Brutalist office block.

No need to strap in for a "ride" on this walkable roller coaster.