This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

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

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

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

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

Carved fountains poignantly placed in parks and in front of special monuments.

An abandoned Byzantine fortress and notorious prison.

The original burial place of this preeminent 18th-century Jewish philosopher was razed by the Nazis.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

A restaurant and observation deck built in a unique broadcasting antenna.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Paris' linguistic guide to the international language of, yes, love.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

Steadily reminding Czechia of its past.

A series of concentric circles represented a bold new experiment in socialist urban planning, and it notoriously difficult to get around.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.