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

Sofia's legislative center is continuously reinventing itself.

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.

A striking symbol of the Bulgarian capital.

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

This museum preserves over-the-top masterpieces that once qualified artisans for membership into a medieval guild.

This church sits upon a peaceful hill and a long, turbulent history.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Home to fantastic views and ancient graves.

A unique underground structure dating back to the 1st century BC.

This ancient theater was once the home of fierce gladiatorial battles.

A modern and feminist reinterpretation of the famous Wallace Fountains.

Liechtenstein's royal family calls this medieval alpine castle home.

Browse through a century of this principality's first popular export.

In one of the world's smallest countries, a royal's personal winery is open to the public.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

An architectural oddity of six stories, accessed by graceful ramps.

This statue stands in honor of Antoine de Saint-Exupéry, the French author of 'The Little Prince' and an aviation hero.

French Time Capsule-19th Century home revealed to the public.

The dynasty’s coat of arms reveals its historical ties to the French town of Moulins and the Spanish crown.

A neo-gothic statue modeled on German Emperor Kaiser Wilhelm II, which had its distinctive mustache shaved off by Nazis in World War II.

A colossal sculptural lion built by the same man who designed the Statue of Liberty.