These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

This elegant arc of a waterfall marks a religious turning point.

An Icelandic island full of diving birds and legend.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

A remote forest of stone pillars along the Lena river.

Some of the world's only freshwater seals live in one very special lake in Russia.

What was once the base for Russia's first nature reserve is now a ghost town, right on the shore of Lake Baikal.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

The world's longest wildlife overpass provides Hilversum's critters with a safe alternative to trying their luck on the roadway.

A grassy pyramid named after a French battle.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.