Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A community of collapsing homes more than a mile out from the Florida coast.

A humid oasis combines recreation with exploration in a unique underwater cavern.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

This picturesque ghost town is located on the banks of the Suwannee River.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

An underwater city for the dead.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Where manatees are the snowbird vacationers in these balmy Florida springs.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A series of caves, tunnels, and wells filled with fascinating figures and symbols.

A visionary Italian architect created an impressive cluster of concrete structures for a family's private tomb.

This serene, turquoise lake in an extraordinary nature reserve showcases a rare natural phenomenon.

This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.

The sunlight passing through the opening of this huge cave system creates a magical effect.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

The bones of some 7,000 soldiers killed in the historic Battle of Solferino are stored here.

During World War II, this rice mill became a Nazi concentration camp.

Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.