Climb right into the heart of this colorful Iceland volcano.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Contemporary art inspired by natural history and science drawing on ancient techniques in a modern world.

The longest continuous lava tube in Oregon.

The oldest operating pharmacy in the world features 800-year-old recipes.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

World's largest cave was only discovered in 1991, and now offers tours to the public.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

One man's extraordinary topiary garden in a small South Carolina town.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

Pick up all of the cosmic knick-knacks under the sun or take a creative writing course, all offered in this novelty storefront.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

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

The largest greenhouse in the world is home to over one million types of plants.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An unreal vintage shop that wears its dadaist influence on its zombie fish.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

This free, take-a-book shop seems like a trick but isn't.