The site of the notorious Camp Sumter Prison is now a peaceful memorial.

The fading, forgotten remains of a once bright and booming factory.

An eponymous directional signpost erected by the first president of the United States.

A giant time capsule not scheduled to be cored until 2040.

Endless rows of boxes of paper records line the hallways of the archaic federal facility where guns are traced.

An eerie site of reverence for those who have completed an epic journey.

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

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

Step inside Lucy, the world's largest "elephant."

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The tallest mountain in mainland Netherlands isn't actually very tall.

A historic Civil War estate-turned-museum looks back on the Confederate States of America.

This large, circular tomb is the final resting place of the first emperor of Rome.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

This ancient settlement contains some of the largest earthen mounds in North America.

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

Bronze statue marks the spinach capital of the world.

Where Elvis Presley received his first Army buzz cut.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

World's smallest skyscraper, the product of a remarkable con.

This small town Texas cemetery is said to be the burial site of a UFO pilot who crashed in the 1800s.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.