Tiki luxury on Nob Hill.

'Cause the fence start shaking, the earth was quaking.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

Less a museum than a bizarre fantasy world created by artists and engineers.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

Unrepaired walls from a 1920 anarchist bomb attack.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This private island is still in the family after a 400-year history including a witch hunt and a pirate.

Two distinctive homes on a New England village green look like a couple of frosted wedding cakes.

A mysterious echo seems to defy the laws of acoustics.

All that remains of the once-booming chain is a single orange-roofed restaurant.

The first evidence of some of the Earth's earliest life was found in this fossilized undersea grotto.

Fossilized sea bottom and lime quarry.

This locally-famous crevasse in New York State is icy all year round.

A man used his Civil War-era fortune to build this sanctuary in memory of his wife.

You can get anything you want at the former site of the restaurant immortalized by Arlo Guthrie.

A careful eye can find hundreds of dinosaur tracks running along the Connecticut River.

All that remains of this Massachusetts town, demolished in the name of progress, is a stone marker.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

This headstone-like marker inscribed with three words has been an utter mystery for over a century.

A monument marks where a convent was burned by an anti-Catholic mob in 1834.

Located just behind a quiet residential neighborhood, this is ground zero for the Salem witchcraft hysteria of 1692.