This elaborate towering structure was once famed for its revolutionary height.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

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

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Every president in history is immortalized in bronze in downtown Rapid City.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

This vast kitty-themed collection illustrates the history of human-cat interaction.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

One of the last active volcanoes on the Eastern seaboard.

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

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The world's longest known cave system.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A toxic ghost town sitting atop a massive coal fire.