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

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

A beautiful and moving memorial set on a little island in the middle of the river in Minsk.

Glowing orb in Minsk houses 8,600,000 items.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

What happens when you cross a mayor and a painter?

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Visitors flock to the historic birthplace of radiobalneology for its therapeutic radium treatments.

This 19th century cyclorama acts like an analogue time machine to a different era.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This 18th-century folly is one of Europe's rare "garden mosques."

Model Trains and Much More in Hamburg.

Thousands of flowers create enchanting pink tunnels over the city streets.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

A slice of central Asia in the middle of Berlin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.