The narrowest house in Buenos Aires is less than 10 feet wide.

A bright little alley in La Boca is a part of tango history.

A gateway to a mysterious network of underground tunnels.

A tower devoted to — and modeled after — the Divine Comedy.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

The deepest metro station in the world.

An Art Nouveau building covered in animal gargoyles and grotesques.

340-foot statue built to honour the Heroes of the Soviet Union.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

Sofia's legislative center is continuously reinventing itself.

This building has two facades of clashing architectural designs.

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

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.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

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

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

The last standing example of an ancient district's teatime tradition.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

You'll find just about anything in this funky Tbilisi flea market.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

A charming beach town in Turkey captures all the colors of the rainbow.