Natural time capsule containing an alien ecosystem.

Scientists use one of the saltiest bodies of water on Earth as a terrestrial base for studying water on Mars.

A little-visited waterfall in an otherworldly landscape.

New fungal and bacterial species call this deadly lake home.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

An entire town preserved as a historic landmark.

On the windswept Dakota plains there is a memorial to circus workers who were struck down by lightning.

This sprawling building built in 1890 was one of Minnesota’s earliest and largest mental health facilities.

The world's largest otter started his life as a high school shop project.

The statue honors the booming birds Rothsay, Minnesota, is famous for.

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

A rusted blade sticks out from the trunk of this tree, left as a memorial to a young man who left to fight in the Civil War but never returned home.

A near tragic event on this bridge helped inspire the classic film "It's a Wonderful Life."

Opened in 1947, this is the oldest continuously-operating drive-in theater in New York.

This elegant structure at the heart of a Finger Lakes town was originally a drinking fountain.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

Legend holds that the Ancient Greek goddess of love once bathed in the waters of this grotto.

A network of ancient Egyptian tombs built into the cliff face along the Nile.

The cluster of igloo-like domes forms the remains of an ancient burial ground.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

An ancient necropolis of magnificent tombs.

This sea stack in Cyprus is traditionally seen as the birthplace of the goddess Aphrodite.