A series of playful yellow penguins share a serious message about the environment.

Looming communist pillar with a Czech twist.

An Orwellian sculpture with eyeball cameras watches passersby.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

A mocking tribute to the past and modern leadership of Prague.

This artificial cave looks like something out of a fairytale.

This doorless 20th-century elevator doesn't stop or slow down.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Paris' linguistic guide to the international language of, yes, love.