A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

A giant floating rubber duck-bunny painted with a different design every year.

Lumps of significant stone from around the world surround a flaming monument for peace.

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

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

A marine aquarium with an astounding variety of fish hides in the basement beneath the famous Palm House.

A comic book store that puts the marvel back in marvellous.

It celebrates a very stinky task and salutes London's fatberg-vanquishing team.

A mysterious shape catches the eye in this 16th-century painting.

This magnificently macabre shield shows the power of chivalrous love in medieval times.

The pockmarks across the building's facade are remnants of the Blitz.

The ritual has been performed uninterrupted for nearly 700 years.

This striking statue brings a scene from the African savannah into central London.

The medieval woodcut-style artwork chronicles life in medieval London.

This mysterious and unique painting is filled with symbolism.

The bones of two medieval royal lions were discovered at the historic fortress.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.

Cold war icon and onetime "hole" in the iron curtain.