Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

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

Atop this library is one of the most beautiful green spaces in Warsaw.

This 13th century Gothic brick castle is the largest in the world by surface area.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

The silly symbol for an underground protest group is now scattered around the city.

Museum dedicated to "the man who moved the Earth."

These massive moving sand dunes have swallowed an entire village and are still on the run.

The site of the first battle of World War II.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

The shiny silver little brother to Copenhagen's Little Mermaid statue.

This unique architectural wonder is home to luxury apartments.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

Remnants of the Nazis' occupation of Denmark linger along the sand.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

The ruins of a monastery where Saint Bridget of Sweden had her revelations recorded.

The world's biggest version of the popular Swedish souvenir.