A field filled with carved medieval tombstones called stećak.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

A war-torn Olympic relic is being overtaken by graffiti and nature.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

These warring psychedelic crags commemorate an unsuccessful military operation.

Yugoslavia's biggest underground airport lies in ruins.

A curious cave church carved into the face of a cliff.

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

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

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.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

These traffic lights celebrate the 100 year anniversary of the women's suffrage movement in Lithuania.

A WWII museum that tries to reenact history.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

Once known throughout Europe, this tiny and unusually progressive 18th century micro-nation within Lithuania now lies in ruins.

You would never guess that before World War II this lonely field was a bustling German city.

Launch site for nuclear war against Western Europe.

The oldest funicular in Lithuania has been climbing this steep hill since 1931.