A small square plaque marks a failed assassination attempt that could have changed history.

One of the most easily accessible examples of the rare 1960s UFO houses.

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

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

The largest fountain in Bratislava.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

An impressive monument to Poland's independence.

A tribute to the first human in space.

A cluster of headless, armless sculptures looms within a popular Polish park.

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

Hamburgers are intensely proud of their tunnel beneath the river.

This strategic isle was once swapped between empires and almost entirely destroyed in a bomb explosion.

A 15-foot-tall statue of the head of the Sopranos family greets passengers at a train station in southeastern Lithuania.

The site where a plot to assassinate Hitler was planned—and its conspirators were executed—is now a powerful memorial to the German resistance during World War II.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

After funding was cut for a memorial to the Danish author, the sculptor had his statue ceremonially lowered into the city harbor.

This poignant tribute to the White Rose movement showcases artifacts related to the heroic anti-Nazi struggle.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A unique seaside cave where Aleister Crowley faked his own death.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.