These ungulates have quite literally bounced back from the brink of extinction.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

An out-of-place grove of sequoias thrives in northern Spain.

This beautiful spit of land was once the summer playground of the king of Spain.

A charming Spanish village sits atop this natural limestone overpass.

The oldest operating roller coaster of its kind, the Montaña Suiza has been thrilling riders since 1928.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

A wunderkammer of mysterious objects and stories.

A slice of central Asia in the middle of Berlin.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

In the summer of 1957, a massive architectural exhibition showed off the future of urban living in this German neighborhood.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Dine at a legendary after-hours joint frequented by David Bowie and Iggy Pop.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

A once-fairy tale mansion now stands in a state of disrepair.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."