Old Faithful erupting is an amazing site, but Beehive, an at-least-as-large geyser, and Old Faithful erupting at the same time is even more incredible. Beehive Geyser is the closer one in this picture. A circular polarizer filter was used to deepen the blue sky showing between the clouds. A filter of some form is a very good idea when shooting near active geysers as the spray can damage your glass.