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

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

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

Rising from the sea like a stone monster.

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

This constantly evolving art space saved an Italian town from its own crippling reputation.

Gorgeous views of Italian mountains and valleys form the backdrop of this unique open-air theater.

A madman's personal garden filled with 1,000 sculpted heads.

This entire town moved to a safe location after it was devastated by an earthquake, but the remains of the original town are still around.

Leveled by an earthquake, this Italian village is now preserved as a massive concrete art project.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

A quiet Sicilian village is home to a cafe that had an important role in "The Godfather."

Cave shrine on Monte Pellegrino.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

A miniature rainforest is growing inside of a Midtown Manhattan office building.