A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

Rusted structures stand like ghosts of Cyprus' 6,000-year-old copper industry.

This museum in a shuttered train station remembers the island's forgotten rail system.

A crumbling ghost town with prime views of the dam that doomed it.

This former Cyprus flight hub is now a crumbling, abandoned ghost complex.

A stunning silver lining to global warming's gloomy cloud.

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

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

The enormous isokinetic structure hangs within a science center in Estonia.

A clerical error gave rise to this imaginary micronation in the southwestern corner of Estonia.

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

This disappearing geyser has been attributed to witchcraft, but really it's all about rainfall.

Man-made mineral caves house massive bat colony.

Mysterious craters may have been home to an ancient cult.

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

A railway bridge leading nowhere stands lonely in the middle of a meadow.

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

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

These crumbling Latvian forts make for some haunting seaside ruins.

3,000 market stands in five former Zeppelin hangars.

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

Art becomes an enchanting part of the environment at this wooded sculpture park.

Citizens of Norway want to gift the peak of Mount Halti to Finland for its 100th birthday.

A little Lady Liberty stands in the Norway town where the copper for the real thing came from.