Catacombs turned marketplace.

Hear the quietest sound from across the dome.

A hands-off space for graffiti artists to hone and display their skills.

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

One part local history, 99 parts gruesome haunted house.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

A statue of the second-tallest Dutchman in history.

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

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

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.