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

A large boulder was declared a local landmark by a popular vlogger.

This free museum is building a collection of books that are banned, censored or burnt around the world.

This Soviet-era "closed town" was a top secret uranium producer often left off of maps.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Built to transport German U-boats through the never-completed Masurian Canal, the locks near this Polish village are now home to a rope course.

Dubbed "Wistom" by locals, this abandoned factory is an urban explorer's dream.

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

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

A wealthy aristocratic family built this Disney-worthy, fairy-tale castle.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

This stunning limestone waterfall is the highest in Estonia.

The widest natural waterfall in Estonia is a sight to see in all seasons.

Flamboyant architecture from the turn of 20th century.

A century-old prison in the heart of Vilnius is now a lively bar, dance club, and artist residency.

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

An abandoned masterpiece of Soviet Brutalist architecture.

Ever-growing collection of devils in art.

Strange secondhand shop showcasing taxidermy and oddies

A former plague hospital turned medical museum.

A curious collection dedicated to human and animal anatomy and pathology.

This 19th-century zoological collection has withstood the test of time.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.