Uninhabited islet in the Caribbean is the sanctuary of giant lizards.

A 220-foot deep watery drop-off, filled with marine life.

The filming location of a shark attack in Steven Spielberg's famous shark movie.

An emerald-green grotto just a short trip from Austin.

They squeal, they nosh, they look like predators.

Turnip-shaped island just off the Michigan shore in Lake Huron.

Friction between grains of sand cause a curious "singing" sound.

A vertically floating hemlock controls the waves and weather at Crater Lake.

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

Bermuda triangle lighthouse, site of mysterious disappearances, left to crumble into the Atlantic.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

The rusted remains of a victim of Hurricane Ike.

Law-protected wreckage serves as a peculiar memorial for an almost forgotten World War II tragedy.