An opal mining town in the middle of Australia where people live, worship, and shop underground.

Aqua white sand highlighted with fiery red rocks.

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

Once housing children next to hardened criminals this historic jail once displayed Ned Kelly's skull until it was stolen.

Australia's first open air museum and antique 3D theater.

Three-story concrete ram with a permanent gift shop.

Concrete spud looks like the North American Sebago.

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

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

A sparkling sandstone cliffside that's worth a visit while it still exists.

An incredible garden taking over the interior of a massive sinkhole.

A small Australian farmhouse became an international icon after appearing on a Midnight Oil album cover.

Red frames showcase remnants of one of New York's original subway stations.

The largest collection of Indigenous Australian artifacts in the world, and the rare museum where wood-and-glass cabinets have trumped interactive exhibits.

A self-funded cemetery with a long list of inhabitants.

This historic observatory contains the world's oldest refracting lens telescope.

Come for the flowers, stay for the bats!

This grim museum collects artifacts and evidence of some of the most sensational antipodean crimes.

New York City's smallest piece of private property.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

Elevated freight railway turned wildly successful urban park.

Captain America, Sub-Mariner, and the Human Torch were all born in this art deco Manhattan masterpiece.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

A bit of retro transportation flair preserved in the world's largest department store.