Climb inside an iron crystal magnified 165 billion times its normal size.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

Lavish royal estate punctuated with heated greenhouses.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

Charles Babbage's proto-computer, painstakingly brought to life.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The anatomical-pathological collection of a man who changed surgery.

Rebuilt remains of a temple to Roman god Mithras.

One part local history, 99 parts gruesome haunted house.

Eighty million natural history specimens call this gargantuan museum home.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This bridge was constructed from the rubble of the infamous Bastille.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The curious underground history of keeping Paris clean.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.