This courthouse, designed in 1928 in Spanish Colonial style, is a nice architectural homage to Tucson's Spanish-Mexican past. If you are downtown, take your time to stroll around and view the building from all sides. Explore the courtyard and its arcade, created by arches and columns, or sit by the cool water of the fountain. The best part of the complex is actually its glittering tiled dome in vaguely Moorish style. Finally, walk upstairs (security check required) to see the only remaining piece of the original Presidio walls displayed there. Access is free during office hours.