Built in 1894, the Lowell Observatory is one of the oldest observatories in the U.S. Located on West Mars Hill Road, the observatory was designated as a U.S. National Historic Landmark in 1965. It was in 1930 that Clyde Tombaugh discovered the dwarf planet Pluto using the Lowell Observatory telescope. Interestingly, the original telescope is used for public education.

The Steele Visitors Center offers guided tours during the day, while at night, visitors can observe the night sky using the original telescope as well as several other telescopes. The observatory has several outreach programs such as camps for preschoolers, elementary summer camp, middle school camp, and several others.

1400 West Mars Hill Road, Flagstaff, Arizona, Phone: 928-774-3358

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