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

An abandoned textile factory on the "island of crows" was home to Estonia's first workers' strike.

Visitors can sit and study the board with this Estonian chess legend and International Grandmaster.

These crumbling Latvian forts make for some haunting seaside ruins.

Flamboyant architecture from the turn of 20th century.

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A museum that chronicles the history of the Nuremberg Trials for Nazi war criminals in the building where the trials were once held.

During World War II, the Nazis repurposed this beer cellar to store stolen artwork.

An ornate sculpture of an ox in repose marks the former entrance to Nuremberg's medieval meat market, which was destroyed during World War II.

The largest fountain in Bratislava.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

This former Nazi labor camp is now a poignant memorial, complete with giant Soviet-style monuments.

Iceland's tribute to its thankless civil servants.

Huge winged monument in the United Kingdom.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

Climb inside an iron crystal magnified 165 billion times its normal size.

A small granite monument marks where the borders of three countries meet.