Resonant stone, that has been played since prehistoric times.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

Mysterious hillside with a continuously burning natural fire.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

This abandoned urban warfare facility is a dream come true for airsoft and paintball enthusiasts.

Hidden in plain sight, Sweden's official ordnance datum is now abandoned.

This secret facility trained seals for the Swedish navy during the Second World War.

Rocks carved with biblical passages in the 1800s.

An abandoned, deteriorating tuberculosis hospital from the turn of the 20th century.

Sweden's southernmost prehistoric rock art is hidden just outside Gothenburg.

An ornate Thai pavilion in the middle of Sweden.

This simple roadside art installation ended up sparking a folk art movement and a controversy of international proportions.