Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

Largest cave system in Africa.

A man-made island in scenic San Francisco Bay.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

World's largest college campus includes a wildlife sanctuary and a former movie set on more than 28,000 acres.

This lovely burial mound is actually a replica that was installed after archeologists excavated the original.

The Battle of Atlanta in 360 degrees, featuring a corpse that bears a striking resemblance to Clark Gable.

Civil War soldiers, captains of industry, and paupers all interred on historic grounds.

3/4-scale model of the White House in Atlanta, Georgia.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

A curious whirlpool formation supposedly capable of entangling or engulfing branches, tree trunks, or whole rafts full of hapless tourists.

A man's home is his castle.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

An underground magnet for ever-changing street art.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

Interactive modern and vintage submarine equipment, World War II relics, and submarine attire.

Ruins of a Carnegie family mansion on Cumberland Island.

This statue inspired by Renoir's famous painting embodies the jovial spirit of Key West.