Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

This excellent museum recreates the boom days of the herring rush in the "Atlantic Klondike."

The Arctic Circle runs through this isolated spot north of Iceland.

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

This modern monument to pagan belief looks like it was transported straight from ancient times.

Each year melting snow turns these Austrian hiking trails into scuba zones.

A collection of intricate sculptures so small they have to be seen through a microscope.

One of the most controversial statues in Romania is an emperor with no clothes.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

This abandoned Belgian fortress is purposefully being left to nature.

The secret medieval communication system will whisk your words above the noise of the crowd.

The world's tallest boat lift stands as a massive piece of industrial tourism.

Remnants of cone-shaped fascist bomb shelters in Milan.

This museum is housed in an unassuming building that witnessed one of the most daring feats of satire in modern history.