Mike Keller has studied Yellowstone’s thermal features and volcanic underworld since high school, and when he’s not busy directing operations for the park’s concessioner, he spends most of his free time geyser gazing. As the president of the Geyser Observation and Study Association, Mr. Keller possesses both an extreme passion and an extensive knowledge about all things geothermal.

A brass quintet inside Mammoth Cave? That's on the schedule for the annual Cave Sing at Mammoth Cave National Park, which will celebrate the coming holidays with an event to bring the surrounding community together.

Another energy company has agreed to drop its oil and gas leases near Glacier National Park.