This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Rising from the sea like a stone monster.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

An uninhabited village that preserves and documents rural architecture and an endangered way of life.

This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

A charming Spanish village sits atop this natural limestone overpass.

Seattle's own bad art museum located inside Cafe Racer.

Museum dedicated to awful artwork.

An Antoni Gaudí masterpiece in Astorga.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

This fascinating and poignant museum chronicles every imaginable aspect of Spanish colonialism in the Americas.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

A Viking-style brewpub named for a Norse sea giant, in the heart of fjord country.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.