Rusting ships sit in a desert where a sea used to be.

This lake in northwest Iran has started turning from green to red more frequently than scientists are comfortable with.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Nuclear waste experts study this prehistoric crater lake to envision landscapes one million years in the future.

These semi-natural waterfalls hint at the park's Victorian-era industrial past.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

A seemingly endless landscape of pure salt stretches far across Bolivia.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

New fungal and bacterial species call this deadly lake home.

Britain's oldest and biggest hole in the ground.

The largest copper mine in Arizona, this enormous open pit emerges from the hills like an alien landscape.

Nicknamed the "Grand Canyon of the North," this open-pit mine in Minnesota has a much shorter history.

The largest open-pit gold mine in Canada.

A deep toxic lake fills this abandoned open-pit copper mine, now a Superfund site.

The precious-metals strikes dating back to the 1860s are now mostly inactive, but this area has become the United States' only domestic source of lithium.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

Gigantic Romanian salt mines used to heal respiratory conditions.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

An underground city of salt.

Explore the quarry where the marble was sourced for Michaelangelo's David.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.