Enter the world under the hill at this ancient UK burial chamber.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The oldest library in Scotland was built from the remains of a church to hold a churchman's library.

A 19th-century time capsule of travel, fiction, and historic texts still available to the public.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

Northern Ireland's Brobdingnagian stepping stones.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

The ancient tomb acts as a calendar that keeps perfect time.

The oldest public library in Ireland.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A neolithic tomb converted into a tiny chapel.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The world's oldest bookshop still in operation.

A Bibliophile's Dream.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

No longer the only, but definitely the oldest, fountain in Greenland.

Small Island off the coast of Greenland.

The world's northernmost flowers cling tenuously to life on desolate Kaffeklubben Island.

In the northernmost city in the world, it's illegal to be buried because it’s too cold for bodies to decompose.

Named for the DeFoe novel inspired by a stranded sailor, this island is known for its rare plants and extreme beauty.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.