The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Rome’s legendary peephole vista is also a former Crusader stronghold.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

Abandoned boats decaying in the largest ship graveyard in mainland Britain.

Britain's answer to the NSA is based out of this deliciously-named circular headquarters.

The highest peak in all of England is plagued by dangerously fickle climate shifts.

One of the highest Roman forts in Britain is set amid dramatic scenery on a notoriously difficult road.

The tomb of a deposed king that drew medieval pilgrims to Gloucester

The oldest residential street in Europe also features an optical illusion.

The world's smallest commercial theater is set up in what was once a urinal for Victorian men.

This Welsh hotel is the spiritual home of the British 1953 Everest expedition, the first successful ascent of Mount Everest.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

The lighthouse is on a island which is connected to another island, which is connected to another island, which is connected to one of the largest islands in the world.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

The stately remains of Llywelyn the Great's mighty fortress.

What was once the world's second largest slate quarry is now a surreal post-industrial landscape

The haunting beauty of this little-visited wreck makes it a true hidden treasure.

A memorial to the only dog ever officially enlisted in the Royal Navy.

South Africa's postal service began with a letter left in a boot beneath this tree.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

Haven for Cape Fur Seals, until the Ring of Death of jumping Great White Sharks arrives.