A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

An underground city of salt.

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.

Over time, this castle grew to encompass the entire island.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

This small group of sand dunes manages to pack in a strange rainbow of colors.

This monument sits at the foot of a mountain from which legend says enslaved people jumped to their deaths.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

Dedicated to a song so popular the request to "Play Shoreline" became part of Swedish culture.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

Home to the oldest operating roller coaster in the Southern Hemisphere.

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

When King Oswald was killed in battle, an eagle dropped his arm here creating a new spring.

On the upper deck of this church-owned parking garage stand eight pillars topped with different Catholic saints.

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

One of the largest collections of intact Victorian-era waterworks equipment in the world.

It's believed that these columns marked the end of the Via Appia.