The unique ecosystem atop an Australian mountain is home to some colorful inhabitants.

A glittering South Asian anomaly in a wealthy Los Angeles suburb.

A submerged village appears when dam levels drop.

This Scottish bridge seems to compel dogs to leap to their death.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

An emerald-green grotto just a short trip from Austin.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

An abandoned colonial French prison notorious for its hellish conditions.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

The glowing blue Nymphaeum of Emperor Tiberius.

Popular river that runs through the remote Serbian municipality of Leskovac.

Rising from the sea like a stone monster.

Fantastic lake on the heart of a fault line.

The largest tidal whirlpool in the Western Hemisphere.

A river with some unusual, and occasionally dangerous, habits.

A curious whirlpool formation supposedly capable of entangling or engulfing branches, tree trunks, or whole rafts full of hapless tourists.

The largest of London's subterranean rivers and once a mad, bad center of London life.

The ghostly remains of an accidental sea.

An island said to shake with the current.

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

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

A botched 18th-century canal silenced one of Sweden's most magnificent waterfalls.