The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Three bridges and one giant canyon make up this fantastic Spanish settlement.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

The signs of a long buried road can still be found hidden beneath a London sewer grate.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A submerged village appears when dam levels drop.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

Enormous underground chamber built to detect 'ghost particles' of the universe.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

The largest stone moai on Rapa Nui.

Walk in the footsteps of the gods and straddle two tectonic plates.

Abandoned medieval hill town.

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

Abandoned power station once home to a squatter community, now being developed into an arts center.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

Geothermal waterfalls in Tuscany.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Remember that scene in the Matrix, when Neo is in the big white room with all the weapons flying by? Well, this is what it would look like if he had wanted trees instead of guns.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.