Volcano Lightning
This picture captures lightning striking a volcano mid-eruption. It's hard to imagine something scarier than these two events occurring simultaneously, but one brave photographer managed to capture this once-in-a-lifetime moment for our viewing pleasure. A similar incident occurred as early as 79 AD when Pliny the Younger observed Mount Vesuvius erupting along with "the transient blaze of lightning."
N3 Cave
Although it may look like this photo was taken on an alien planet, it actually captures one of Earth's most incredible salt caves. The N3 Cave is located in Qeshm, Iran. The name is an abbreviation—the cave was first discovered by three naked people. Since the cave's entrance was beyond a pool of water, they stripped down to their birthday suits to swim through it and explore.