Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

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

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

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

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The footprint of a frustrated devil in Munich's Cathedral.

A fearsome dragon clings to a corner of Munich's city hall.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Hamburgers are intensely proud of their tunnel beneath the river.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A restaurant and observation deck built in a unique broadcasting antenna.

Metro station with a claim to rock n' roll fame.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

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

Steadily reminding Czechia of its past.

Looming communist pillar with a Czech twist.