Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

Avant garde house of Pierre Cardin on the Cote d’Azur.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

An icy lake tucked among jaw-dropping alpine panoramas.

This Parisian café sticks almost exclusively to an ethos of reuse.

Abandoned railway line circling the city of Paris.

Notorious artist squat renovated into legal studios.

A small man-controlled waterfall powers an Art Nouveau elevator and is accessed via narrow gauge, solar-powered tramway.

Crop circles inspired this whimsical garden in Germany.

An abandoned train station in Munich constructed for the 1972 Olympic games.

Go surfing on this urban wave, "hacked" by local surfers.

A former ironworks that was the first UNESCO industrial site.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

One of the most easily accessible examples of the rare 1960s UFO houses.

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

Residents of Berlin take their coffee and cake in one of the city’s most restful spaces: a cemetery.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

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

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

Ruins of a German Castle on top of a towering stone pillar.