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

A riverside park built around the ruins of a massive dam that collapsed in 1909.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

The oldest surviving presidential residence in the United States.

This 15-foot tall obelisk commemorating the Philadelphia-Baltimore railroad connection sat neglected for over a century.

The singer, actor, and activist lived here during his final years, and now it’s a museum dedicated to his legacy.

America's smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

Alexander Hamilton’s creation caused quite a bit of controversy.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.

An Irish Memorial commemorating those who perished due to potato blight.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A daily replay of the experiment that proved the rotation of the Earth.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

The abandoned coal loading dock is a canvas for unsanctioned art.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.