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

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

The oldest working mechanical clock in the world.

This controversial museum includes such detested exhibits as a chocolate suicide bomber and fecal-smelling digestion machine.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

Roadside display for a popular fruit and vegetable stand.

Three-story concrete ram with a permanent gift shop.

One of the first big sculptures anywhere in Australia.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

The largest shot tower in Australia is a unique reminder of industrial ammunitions history.

The King is honored by an elaborate grotto on a continent he never visited.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

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

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

A youth-centric science center hides an industrial triumph.

The glacier tucked within a New Zealand rainforest.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.