Lenticular Cloud over Klyuchevskaya Sopka Mountain, Russia by Denis Budkov: Klyuchevskaya Sopka is a stratovolcano, the highest active volcano of Eurasia. Its steep, symmetrical cone towers about 100 kilometres from the Bering Sea.
I went here and stood over the falls on a rock that stuck out, no guard rails and you can stand in the water not far from the edge. So beautiful! Kaieteur Falls, a waterfall on the Potaro River in central Guyana, South America.