Fall colors sweep across the Scottish Highlands.
Blood Falls bursts out of a massive glacier in Antarctica, the result of extremophile microorganisms living a lightless existence below the ice, changing the chemistry of water as it seeps at the surface.
An iconic temple complex at Angkor Wat, Cambodia.
Clouds envelop a mountain in eastern Java.
A researcher walks among Adelie penguins in Antarctica.
Graffiti adorns Melbourne like tattooes cover the arms of a hipster.
A sundog throws a spotlight on Amundsen-Scott South Pole Station and the geographic south pole.
Scientists scout out the barren Dry Valleys while doing fieldwork in Antarctica.