An unusual round church in London with a Templar past.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Museum preserving torture methods from the past.

One of the largest legal spray spots in Hamburg.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

This sign marks the entrance to a tiny proto-state within the small country of Moldova.

This abandoned Soviet circus is slowly being restored to its Communist-era glory.

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

This enormous 32-foot painting depicts Poland's greatest medieval battle in glorious detail.

A World War II torpedo launch station abandoned off the Polish coast.

This open-air museum was originally a World War II testing ground for German missiles and rockets.

A collection of old neon signs from all over Poland line a secluded courtyard.

What was once an underground Nazi city is now Europe's largest bat reserve.

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

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

A peculiar family mausoleum built by a German nobleman captivated by the occult.

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

The site of the first battle of World War II.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The apartment building where JFK's assassin lived after defecting to the Soviet Union.

Remains of the old fortification along the Western border of the USSR, now an elaborate defense museum.