Concrete strongholds stand guard over the Golden Gate.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Pilgrimage site for star-crossed lovers.

Erotic art covers the walls of the largest ancient pleasure palace.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

"We Seceded Where Others Failed."

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

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

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Quite simply the largest tree in the world (by volume).

A tribute to Ponce de Leon's supposed quest for eternal youth.

Ancient snack bar of the Roman Empire re-opened.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

2300-year-old Roman road connecting the empire.

The "lovely red Vega" of the legendary record-settling pilot.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

A bizarre roadside attraction and the first instance of miniature golf in the world.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.