A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

The metal leaves on this tree are engraved with the names of Holocaust victims.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

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

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

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

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

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

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The beautiful baroque library of the Hapsburg empire.

Museum devoted to the artificial language of Esperanto.

Baroque celebration of the end of the Great Plague of Vienna.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Op-art architecture designed for happiness.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.