The Pima County Historic Courthouse is among Tucson's most beloved landmarks. This List of tallest buildings in Tucson ranks high-rises from a starting point of at least 100 feet (30 m) tall, based on standard height measurement.The Pima County Courthouse, located in downtown Tucson, Arizona, is a former county courthouse building of immense historical and architectural significance. Experience 400 iconic aircraft, from a Wright Flyer to a 787 Dreamliner.