Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This massive water spout has been luring visitors for hundreds of years, some to their death.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

Clusters of huge boulders in the Australian Outback.

Granite rocks that concentrate waves into powerful jets.

The romance of early commercial flight still fills this Art Deco destination.

At 207 feet, one of the world's longest continuous escalators.

Look closely and you’ll notice that the color changes a third of the way up the tower.