Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

Where visitors can play more than 150 retro arcade games.

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

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

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

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

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

An underground city of salt.

This street has over a half-dozen names, all at once.

A collection of miniature, symbolic sculptures hides in plain sight across Kyiv.

Marvel at the excessive luxury of the ousted Ukrainian president's former estate.

This unique Lady Liberty is one of the only examples of the figure sitting down.

This exquisite, alienesque piece of Soviet architecture is being threatened by modern shopping malls.

Kyiv's answer to Muscle Beach is a Soviet-era gym made from scrap metal.

A fortress built to pacify local uprising that had a stint as a Nazi concentration camp before becoming a five-star hotel.

This underground transport hub doubles as an art gallery.

One of the world’s best microminiaturist, Nicolaï Siadristy displays his lifetime of tiny creations in this museum.

Monumental sculptures guard many of the graves, transforming this necropolis into an open-air fine art museum.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

A quirky collection flush with information on commode culture from ancient times to modern day.

This hill is known for its connection to the occult in Slavic tradition.

The deepest metro station in the world.