These wooden balconies that are both decorative and functional.

This large sand dune in the Netherlands is home to wind-whipped trees with "floating" roots.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

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

Yup, that's a 330-foot yacht passing over the highway.

The 20-mile causeway that separates the Netherlands from the sea.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

France's most famous cemetery, with some of its most curious tombs.

Notorious artist squat renovated into legal studios.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Museum dedicated to the terror regimes of Hungary.

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

A fake Transylvanian castle houses a cathedral of antlers.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

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

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

The gargoyles and grotesques of the 21st century are here—22 emoji built into a new building in the Netherlands.

This abandoned five-star hotel is now a five-star urban exploration destination.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.