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.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

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

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

The oldest surviving botanic garden in the United States.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

An abandoned stretch of highway, deteriorating next to the operational one.

A toxic ghost town sitting atop a massive coal fire.

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

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

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

The Greek War of Independence was declared at this medieval Byzantine sanctuary.

Life and death are on parade at the most reliably perilous site of “the Great Migration.”

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

It might not be the prettiest pyramid in Egypt, but it may be the muddiest.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

This unassuming tree stump reportedly traces its roots to the famous pharaoh queen's reign.

A network of ancient Egyptian tombs built into the cliff face along the Nile.

This ancient structure is widely thought to be the oldest intact pyramid in the world.