The ghostly remains of an accidental sea.

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

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.