This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Vast stretch of tide-pools with a unique Moroccan charm.

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

Known for the tunnel that leads visitors to the water.

New Zealand's epic shrine to all things puzzling.

Highly spherical boulders on the shores of New Zealand.

A glacier pocked with ice caves and surrounded by rainforests.

The glacier tucked within a New Zealand rainforest.

A perfect turquoise lake colored with glacier dust.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Deadly scalding and one of the largest hot springs in the world.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

Tubing through a cave lit with glowworms is a magical underground experience.

Some of the clearest water anywhere in the world.

The world's only complete colossal squid specimen is on display at the Te Papa Museum.

This deadly little sliver of beach has seen hundreds of whales beach themselves over the years.

Folklore and history carved into Brittany's coast.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

A huge Megalithic chamber tomb located behind a cafe.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

The famous winding walk at Chartres is surrounded in mystery and myth.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

Famously misunderstood wonder of the ancient world