Stockholm's last remaining paternoster elevator.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

Roman ruins top white travertine terraces formed by ancient hot springs.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The library's graceful rotunda is like a bibliophile's temple.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

This handsomely carved wooden church is more than 800 years old.

The world's northernmost botanic garden has 25 collections of plants from arctic and alpine regions.

An intricately carved Viking church overlooks a glistening fjord.

The world's largest underwater restaurant is submerged off the southern tip of Norway.

Norway has built what may be the world's most beautiful public toilet.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

Walk 2,300 feet above the ground on the "Troll's Tongue."

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

A lush indoor jungle fills this bustling Madrid transportation hub.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Neglected resting place of some of the city's early luminaries—and a woman encased in concrete.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

A collection of artifacts from Maryland's maritime past.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.