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

A decommissioned submarine base makes a great space for graffiti art.

The gutted remains of this Estonian mansion are a monument to a tragic love.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

A series of playful yellow penguins share a serious message about the environment.

An enormous and lavish Gothic church in Czechia.

Monument to a suicide protesting the Soviet invasion.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

Looming communist pillar with a Czech twist.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Bohemian paradise covered in majestic forests.

This former quarry is now a picturesque gorge that hides a sunken lake.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

Two monstrous faces loom over a village in Czechia.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Walk through Czech history in Prague's largest graveyard.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The first museum in the world devoted to sexual gadgetry.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

Oriental bazaar in the heart of Sarajevo.

Humble beginnings for one of the world's most famous scientists.