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

Extraordinary objects lurk in this quintessential regional museum.

These unusual rooms on wheels are holdovers from the 1960s.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A former major munitions plant that has been converted into a sprawling art space.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

At 207 feet, one of the world's longest continuous escalators.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Abandoned bull fighting ring, slowly falling apart in Uruguay.

A beautiful young girl said to have been buried alive in her coffin…

A bright little alley in La Boca is a part of tango history.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This stunning mass of ice spans 121 square miles and is still growing.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A giant ball made from pieces of an old Jeep.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

This public park was the site of the largest civilian disaster of the Civil War.

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.