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

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

Atop this library is one of the most beautiful green spaces in Warsaw.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

Hundreds of notes give thanks to the patron saint of lost causes.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

A delightful museum entirely dedicated to the tiny homes of dolls.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A statue honors the children who fought Nazis in Poland.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A hidden art gallery in an abandoned Warsaw fort.

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.

Warsaw's fantastically preserved gasworks...almost.

At night, this memorial illuminates a ghostly outline of a footbridge that connected two sections of the Warsaw Ghetto.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

An agreement meant to honor the Duke of Buckingham led to this unusually-named passageway near Charing Cross.

A relic from one of London's worst 19th-century slums.

This overgrown Victorian chapel made of corrugated metal looks utterly out of place.

An Iron Age hillfort rooted in Arthurian legend was made famous by musician Peter Gabriel.