A huge white 'A' painted on Sentinel Peak has overlooked Tucson for more than a century and is periodically recolored during civic events. The summit also provides an easy route point for viewing the city's geology and urban history.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: tucsonaz.gov/Departments/Parks-and-Recreation/Parks/Sentinel-Peak-Park-A-Mountain