This everlasting lightning storm may be the world's largest generator of ozone.

Iron Age "bog person" preserved for over 2,300 years.

Unrepaired walls from a 1920 anarchist bomb attack.

World's largest cave was only discovered in 1991, and now offers tours to the public.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

See just what life was like in a 19th-century prospecting town.

The explorer Captain Cook may have named it White Island, but the Maori call it Te Puia o Whakaari – The Dramatic Volcano.

Centuries-old bridges grown from tangled roots.

The ship that got left behind.

A precariously perched golden rock defies gravity and brings pilgrims from across Myanmar.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

On Japan's Tashirojima Island, cats are king.

Natural time capsule containing an alien ecosystem.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

An ancient Viking village in North America that predates Columbus by 500 years.

A real-life "hobbit" cave in Flores, Indonesia.

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

Remote, volcanic island that Darwin, Hooker, and the Royal Navy shaped into a thriving, artificial ecosystem.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

The world's largest statue of Mao Zedong looks out over the city where he discovered Communism.

Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

A 30-acre garden inspired by the principles of modern physics.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.