These 13th century documents come housed in 18th century shelves organized by a 19th century historian.

This region of Slovakia boasts some of the most plentiful opal mines in the world.

An extraordinary museum devoted to the pop art legend created by Slovak artists.

An open-air museum of 18th-century homes and churches transported from various villages in Southern Poland.

On this Polish road, an optical illusion makes cars seem to roll uphill.

This symbol of Polish heritage survived the occupation during World War II, hidden in plain sight.

A tree planted by Marie Curie is treasured by the Radium institute that she set up.

This fairytale medieval church in Poland originally spent centuries in Norway.

The ruins of a 13th-century monastery that long served as a place of refuge from wars and raids.

This tower in a small Polish village uses the power of a sacred bell to ward off mischievous weather spirits.

The traditional Polish croissant, folded 81 times into the shape of a horseshoe, is a legally protected cultural treat.

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

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

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

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

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

Warsaw's fantastically preserved gasworks...almost.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

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

An underground city of salt.

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

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

This former medieval prison now unlocks Estonia’s rich photographic history.

Historic slum of Tartu.