Sometimes we use social media for teaching, too.
This is Tucson, around 1880! The street where the farms end and the city begins is Main Avenue, which was the Spanish Colonial Camino Real. The light area that runs L-R amidst the farms is the Santa Cruz River, which flowed year-round at that time. The park is now called Presidio Park.
Existing buildings from this era are the Fish-Stevens House (now part of Cafe a la C'Art / Carte Blanche Catering and the Tucson Museum of Art and Historic Block), and the Sam Hughes house. The elegant 2-story adobe home across from the Congregational church belonged to Barron Jacobs, a Tucson merchant, banker, and legislator. It was torn down in 1968 (photo:
https://tucson.com/jacobs-house/image_757fb914-7cd4-11e5-bc12-fba28b15daf6....).
This photograph is from the collection of the Tucson Museum of Art Library.