It took more than 20 years and a sharp eye for one man to assemble this quirky collection.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

Dr Barnes' $25 billion private collection of art and arboretum.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Yo, Adrian!

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

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

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

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

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

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

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This schoolhouse for Black American children is one of the oldest remaining in southeastern Ohio.

The site of the worst mining disaster in Ohio's history.

An abandoned asylum incorporated into a college campus.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

Surrounded by industrial sprawl, a small monument marks the site of William Penn's first landing in Pennsylvania.

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

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

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

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