Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

1513 Turkish world map, full of European state secrets and snarky commentary.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Turkish adventurer antiques in the heart of the Grand Bazaar.

This building has two facades of clashing architectural designs.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

Sofia's legislative center is continuously reinventing itself.

A vast Communist-era exhibition space in the Bulgarian capital.

"Holy Wisdom" overlooks the city that became its namesake.

Eastern Bloc nostalgia, anybody?

A striking symbol of the Bulgarian capital.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

This museum offers a journey back to the Belle Epoque era of Romania.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

A celebration of all things tacky, garish, and bizarrely creative in the Romanian capital.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

This once-derelict building is now one of the most beautiful bookstores in the world.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

A scene from one of Hungary's most famous novels.

A diminutive statue that was inspired by the sculptor's own daughter.

The largest statue of this convex, homogeneous object with just one stable and one unstable equilibrium point.

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

This sculpture honors the man who was known as the "Righteous Among the Nations."