An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

France's most famous cemetery, with some of its most curious tombs.

An homage to the medieval rulers of Bulgaria.

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

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

A striking symbol of the Bulgarian capital.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

This historic black and white monastery is one of Bulgaria's architectural jewels.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

Thanks to its heroic service during WWII this Soviet castle has been turned into a monument towered over by a brutalist titan.

The southernmost Anglican cathedral in the world has whale bones standing in its yard.

Single runway interrupted by a busy road that cuts across its middle.

The Earth's saltiest natural body of water belches toxic gas.

A powerful tribute to the victims who suffered under Ethiopia's most devastating regime.

Supposedly this Ethiopian chapel holds the Ark of the Covenant, guarded by virgins who cannot leave the building.

Massive stele returned to Ethiopia after 70 years in Rome.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

The hottest place on the planet.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

The oldest housing complex in Riga is a mini timeline of architectural trends.

A black cat protests the City Guild in Riga's Old Town.