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Hang Son Doong, a cave in Vietnam, is big enough in places to accommodate a New York City block of skyscrapers. The cave in the Annamite Mountains contains a river and jungle (its name translates to "mountain river cave") and even its own thin clouds, and its end remains out of sight. It's part of a network of about 150 caves in central Vietnam near the Laotian border.
A single frame from yesterday's stack, picked due to the lack of light trails along the horizon. Coincidentally it shows Orion's constellation directly above the stones. I processed this differently to create a more timeless and isolated feel and it really shows why the Stonehenge landscape deserves to be in the top five locations for stargazing in the UK.