Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

Naturally formed rock city in Poland.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

A national collection of Communist-era musical posters.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

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

Warsaw's fantastically preserved gasworks...almost.

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

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

A hidden art gallery in an abandoned Warsaw fort.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

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

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

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

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

An underground city of salt.

This archipelago homestead-turned-museum has remained the same since its last resident, born in 1897, died in 1973.

Atop this electronic store resides a massive fighter jet.

Home to the finest collection of peasant boats in Finland.

These large stone piles are ancient burial sites.

Dedicated to the outnumbered Finnish forces who pushed back Soviet forces during the conflict.

One of the oldest structures in Helsinki is this burrow grave that dates back to the Bronze Age.

These lakeside pictographs were some of the first pieces of prehistoric artwork found in Finland.

This misspelled graffiti reappears every time it is removed.