Quality time with reindeer in the stunning scenery of their natural Lappish habitat above the Arctic Circle.

This fantastical icy castle is built anew every winter.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

Pigduck of Turku.

Crawling into this primordial cave may feel disconcertingly familiar.

Legend has this precariously placed rock was placed by giants. Science has another explanation.

Extraordinary animals sculpted from leftover junk.

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

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

Launch site for nuclear war against Western Europe.

Open-air museum with a large collection of Soviet-era statues.

Once known throughout Europe, this tiny and unusually progressive 18th century micro-nation within Lithuania now lies in ruins.

What almost started out as a spite house became an eccentric's found object masterpiece.

Spend the night in 1920s Latvia in this historic recreation and movie set.

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

Man-made mineral caves house massive bat colony.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

Hundreds of small crosses have been carved into the bark of the trees outside this small Estonian village.

Historic slum of Tartu.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

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

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

Tombstones buried in overgrown grass mark the deceased occupants of this abandoned graveyard.