This whimsical stacked cabin looks like something out of a children's book.

The only Florida state park with publicly accessible caves.

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

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

Stay in a room with a view... of the bottom of the ocean.

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.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

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

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

For decades, it has disappeared and reappeared as water levels rise and fall.

The humble field where the first Major League Baseball game was played.

Where the oil industry began.

Pittsburgh's literal underground railroad.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

A glittering Thai Buddhist temple in suburban Pennsylvania.

Steepest flood safety railway in the entire world.

Built in 1931, this small passageway is believed to be the first modern skyway.

Thousands of people walk over this fantastic work of art every day, but how many notice it?

A 115-year-old restored German dining hall awaits those who venture beneath the Minnesota State Capitol.

These curious caverns have been home to mushrooms, gangsters, and disco.

Driftwood dinosaurs lurk within trees covered in a rainbow array of avian abodes.