A bright little alley in La Boca is a part of tango history.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

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

After much poking and prodding, this island is decidedly not a magnetic anomaly, but it sure is pretty.

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

An unphotographable nightly march of tens of thousands of "fairy penguins" from sea to shore.

Come for the flowers, stay for the bats!

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

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

A clear example of the process of erosion in action.

One of the best beaches in the entire world.

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

The only pollutant in the clear blue water is sunscreen.

A massive stairway that almost wasn't leads to one of Australia's most scenic vistas.

A small, but award-winning beach known for its literally spotless reputation.

A surprising and unconventional mosque hidden in the subsoil of Istanbul.

Balanced on four stone pillars, this historic tower was the site of a tragic political assassination.

Remnants of successive wars and Muslim colonialism in the 11th century.

This ancient abandoned church in a remote part of Turkey is in danger of falling over.

This ancient city—home to nine civilizations—is soon to be buried under 200 feet of water.

A mysterious ancient cemetery with Roman sarcophagi and Lycian inscriptions.

Standing proud atop a Turkish bluff, this Ottoman palace has retained its grandeur despite being abandoned for centuries.

1513 Turkish world map, full of European state secrets and snarky commentary.

The most metal church of all time was built in record time because of an international, pious pissing contest.