This extraordinary geological oddity resembles human-made pavement.

This historic Australian bridge was built by convicts with giant stone spikes to prevent cattle from falling off the sides.

One of the best beaches in the entire world.

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

A clear example of the process of erosion in action.

A plaque at the lighthouse where Frederick Valentich made his last radio contact before he vanished without a trace.

Concrete spud looks like the North American Sebago.

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

Made from local Irish moss, this pie is served only in Prince Edward Island's potato museum.

This monster fiberglass crustacean stands watch over the self-proclaimed "lobster capital of the world."

Three buildings constructed of over 25,000 multicolored glass bottles.

An ever-changing gathering of crude wooden figures haunts the St. Lawrence River.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This unusual building straddles two countries.

One of the few surviving street funiculars in the world.

This former prison now houses a lovely library devoted to Quebec's oft-maligned English-speaking history.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

The Isle of Wight’s “Island Line” serviced by former London Underground trains from the 1930s.

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

This stunning mass of ice spans 121 square miles and is still growing.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.