Famed pilot Charles Lindbergh came to dedicate the new municipal airport on Sept. 23, 1927.
Firefighters apply a steady stream of water during the Pioneer Hotel fire, which killed 29 people.
The Pioneer Hotel, on the northeast corner of Stone Avenue and Pennington Street, around 1950.
Tucson Police Chief C.A. Wollard, standing at far left, at John Dillinger's arraignment. Dillinger is at center, with his hat on his knee.
Navy P-3 (A and C models) sit in storage at the Aerospace Maintenance and Regeneration Center, commonly called the "boneyard," at Davis-Monthan Air Force Base.
A rendering of the Phoenix Mars Lander. The program was headed by the Lunar and Planetary Laboratory at the University of Arizona.
Old Main, the original building of the University of Arizona, was built in the open desert, at a distance from the town of Tucson.
Journalist Ross Browne sketched this image of Tucson in 1864 as the U.S. Civil War raged.
A photo shows St. Mary's Hospital at the turn of the 20th century. The hospital was one of many major "firsts" for Tucson in the 1880s.
In 1910, Congress Street (looking west) was still unpaved but was the principal roadway in downtown Tucson.
Tucson artist Cal Peter's conceptual drawing of the Royal Spanish Presidio in Tucson, circa 1795. This view is looking southeast.
Reconstruction of San Agustín Mission Garden is under way at the foot of Sentinel Peak by Friends of Tucson's Birthplace.
A well-known Tucson statue memorializes Father Eusebio Kino, who first visited the Sobaipuri people in 1692.
Spanish authorities assigned Col. Hugo O'Conor to create a line of defense along the colonial frontier. The Tucson presidio was one of those posts.
This picture shows what a part of the Hohokam's Honey Bee Village in today's Oro Valley might have looked like around A.D. 1125. The Hohokam early on used pit-house construction.