Gargantuan home of Russian science.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

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

An homage to the medieval rulers of Bulgaria.

Sofia's legislative center is continuously reinventing itself.

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

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

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

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

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.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

This eye-catching roundabout sculpture commemorates one of England's best World War II-era "shadow factories."

This historic factory peddles classic toys from the picturesque English county of Devon.

The western face was supposedly left clock-less to snub the Welsh.

This enormous spiral sculpture looks strangely out of place on the edge of a housing development.

This medieval manor house was equipped with secret compartments for hiding priests.

This Georgian architectural masterpiece is the only cloth hall left in Britain.

The red letters in the literary pavement leading to the library form a mysterious code.

One of the few surviving street funiculars in the world.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.