Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

3,000 market stands in five former Zeppelin hangars.

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

A series of abstract, silly sculptures represent the works of a great modern classical composer.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

Notorious artist squat renovated into legal studios.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Paris' linguistic guide to the international language of, yes, love.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This Ukraine alleyway has become its own little island of forgotten things.

Secret North Korean passage discovered below the world's most dangerous border.

About as hidden as can be, this specialty coffee shop is wedged between multi-story buildings at the end of a dark, skinny alleyway in Seoul.

The burial ground of two kings and a queen is now a calm city park in the middle of bustling Seoul.

Monumental sculptures guard many of the graves, transforming this necropolis into an open-air fine art museum.

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

When you've got to go, you've got to go.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

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.

This attraction was abandoned after the Chornobyl disaster.

Special benches that play Chopin's music are scattered throughout his native city.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.