A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

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

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This now-defunct synthetic fuel plant was once a major cog in the Nazi war machine.

Ruins of a late 1950s Polish ski jump ramp in the middle of the city.

A tribute to the first human in space.

Once home to some 250,000 volumes and priceless art artifacts, this Polish estate was a target of bombing during World War II.

A heavily politicized roundabout discussing the state of a heavily politicized country.

These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.

This mushroom-shaped rock has frustrated and fascinated locals for centuries.

Down this Cracovian street resides a plaque with a stark message about the city's air pollution.

This museum in the tower of the oldest church in Gdańsk, is home to centuries-old time-keeping devices and the world's first pulsar clock.

The last king of Poland was interred in this church nearly 200 years after his death.

The majority of the highest mountain in Poland is actually located in a different country.

A marker honors the brief peace found by a tormented artist in the fictional land of Kcymaerxthaere.

Disturbing works of outsider art, carved from whole logs.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.