A man-made island designed to look like a massive battleship.

The ruins on a deserted tropical island in the Philippines bear the scars of WWII.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

A broken man's homemade, seaworthy ship rests in the middle of the Canadian prairie.

This lake-bound geographical marker sits at the point where three European countries intersect.

At this California chicken ranch, four bucks will get you 18 eggs and a chorus of dancing animatronic poultry.

If they push on just the right spot, even the weakest person can move this titanic boulder.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

The ancient latrines of the Greeks, in all their public glory.

A sweet symbol marks the place where torturous executions were once carried out.

The effect of this ancient form of image projection situated atop an 11th century Moorish palace is thrilling.

This woodland architectural installation acts as a camera obscura for the heavens.

The Bristol Camera Obscura housed in an ancient windmill.

360° views of the city plus five floors of optical illusions and hands-on science.

An offbeat angle on the ocean viewed through an antiquated lens.

A large camera obscura, constructed entirely from digitally fabricated components.

The great Danube river starts here.

A clock designed to run with perfect accuracy for 10,000 years.

The world's second-largest sundial, made entirely out of stone.

The oldest working mechanical clock in the world.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.