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.

Space is running out if you want to join the Candlelight Tours that mark the traditional holiday celebration at Bent's Old Fort National Historic Site in Colorado.

On December 11, living history players will take visitors back to 1901 for a maritime Christmas celebration on the San Francisco waterfront.

Start dreaming and planning. You can now go on-line to check out the 2011 field course list of offerings from the Rocky Mountain Nature Association. These field courses conducted in Rocky Mountain National Park offer the usual photography and backpacking courses, as well as some eye-openers, such as the children's overnight birding camp.