The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

Launch site for nuclear war against Western Europe.

Ever-growing collection of devils in art.

Folky pharmaceuticals abound in this medicinal reliquary.

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

This impressively complicated radioastronomy research center was once a tool of Soviet spies.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

This ornate church has survived Nazi and Soviet occupation, including a short stint as a Soviet-era gymnasium and cinema.

These crumbling Latvian forts make for some haunting seaside ruins.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

Relics from an era long gone, sit idle outside this Estonian museum.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

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

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

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

This church also serves as a lighthouse complete with a beacon.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

One of the world's first dedicated bank buildings in the world is now the oldest one.

Stockholm's narrowest alley is barely over two feet wide.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

A Viking-style brewpub named for a Norse sea giant, in the heart of fjord country.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Walk 2,300 feet above the ground on the "Troll's Tongue."