An ornate private entrance to the Vienna subway built specifically for the emperor.

This ancient Roman aqueduct once funneled water to Diocletian's palace.

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

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

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

On a teardrop-shaped island in the Danube, the ruins of a convent and the final resting place of a saint.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

Also known as Uncle Karl, the beloved bronze copper keeps a watchful eye on St. Stephen’s Basilica while people rub his lucky belly.

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

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

A highly-criticized monument in Budapest has become the site of a makeshift Holocaust memorial.

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

A monumental palace that began as a stock exchange, became the headquarters of Hungarian Television, and spent years largely unused.

This building has survived for more than a century and remains virtually untouched.

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.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

England's largest white horse isn't even white.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

A tiny church on a man-made island in the Adriatic.

Relics designed to contain and conceal Yugoslavian submarines.