The U.S. Fish Commission’s effort to mass produce carp.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

A men’s restroom became a sandwich shop.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

This landmark cemetery in Boston was created more than 300 years ago.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Where America’s first doomsday cult awaited the end of the world.

A rare view of a preserved Victorian science museum.

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

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

The first American axe throwing club.

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

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

The first American department store, and home to the largest operating musical instrument in the world.

One of the oldest of its kind.

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

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