An easy-to-miss plaque marks the building that first held this 19th-century telephone innovation.

An abandoned gun-funded 19th century utopia.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.

The largest collection of historic military firearms in the United States.

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

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

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

Remnants from a time before electricity.

Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

Too much gossip or just missing curfew could land you in here for a couple of days.

A towering sword embedded in the ground commemorates the legendary Slavic ruler.

In an area known in Bratislava’s postal history, this sculpture sits equipped with a functional postbox.

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

A massive sculpture of an obscure Celtic coin that has become a symbol in Slovakia.

The largest fountain in Bratislava.

A sculpture of the beloved author surrounded by characters from his fairy tales.

Dedicated to a synagogue that was destroyed after having survived World War II.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.