An Australian lake whose pink hue defies scientific explanation.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Dramatic river bend surrounds a natural red-rocked pedestal.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

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

A huge musical instrument played by the ocean.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

Giant marble phalluses on the sacred island of antiquity.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A fiery crater has been burning in the Karakum Desert since 1971.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

This tiny little cave was said to have been a refuge for a saint with a glowing arm.

This remote lake in Siberia supposedly contains a fearsome sea monster.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

This geothermal hot spring hides beneath a slowly growing mineral dome.

This ancient bridge made of stone slabs is said to be reserved for the devil to sunbathe.

This disappearing geyser has been attributed to witchcraft, but really it's all about rainfall.

A naturally occurring tunnel in this Nordic mountain makes it look like it's been shot.

This Scottish manor house is a lush relic from the life of a literary great.