Sitting atop a hill just west of downtown, this national historic landmark was built by Percival Lowell in 1894. The first sighting of Pluto occurred here in 1930. Weather permitting, visitors can stargaze through on-site telescopes, including the famed 1896 Clark Telescope, the impetus behind the now-accepted theory of an expanding universe.
The paved Pluto Walk climbs through a scale model of our solar system. Evening programming includes a video about the making of the new, seven-story Discovery Channel Telescope, which is located 40 miles southeast of Flagstaff.
