This symbol of Polish heritage survived the occupation during World War II, hidden in plain sight.

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

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

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.

This bell stars in a tragic love tale and is said to make wishes come true.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

An underground city of salt.

The prototype for all Nazi concentration camps.

The ground on which Shakespeare’s initial playhouse once stood.

This seemingly humble work of art—a block of limestone—conceals a daring story and an artistic tour de force.

This monumental neo-Renaissance tomb in Vyšehrad Cemetery is the final resting place for Czech cultural legends.

A sculpture of a courtesan towers above Lake Constance, recalling a church scandal.

Likely the world’s only place where you’re meant to skate on top of cars.

A thin golden line commemorates the deadliest terrorist attack in recent German history.

Constantly maintained, this organ is playing a six-century long composition by John Cage.

A strange rock formation with numerous legends trying to explain it.

Where the interconnection of German power grids should be.

The resting place of 18th century German mummies.

Check the time in 145 countries at once with this East German relic.

A quiet memorial to the victims of the Soviet-backed communist regime in Czechoslovakia.

Home to an octopus slide and a humorous playground-sized cryptid.

An intersection between architecture, industrial construction, machine, and scientific instrument.

A bronze sculpture honoring a famous Serbian writer and a character from his novel.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.