A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

The "dragon babies" of southeastern Europe.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

A relic from the Industrial Revolution got a second life as a contemporary performing arts space.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

Elegant marble and old vaults fill this historic Dutch bank turned office space.

One of the oldest masonic temples in the Netherlands, built in 1757.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

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

It is said a heartbroken man visited the gap every day to stare blankly out at the sea.

A set of 27 bamboo tubes creates an eerie soundscape that changes with the wind.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

This man-made mound monument was built out of soil from all across the Polish empire.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Real bones which are said to have belonged to a Polish dragon.

Two volcanic lakes in an enormous crater formed in a prehistoric eruption.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.