Originally drawn in Adobe Illustrator after our 2010 trip out West.
The "mandala" above was a product of our third roadtrip West. Before a roadtrip, preparations can also result in a diagram, as I get psyched for what lies ahead. (See 2008 Mindmap.) For me, this helps my black-box soul get ready to absorb and digest everything in its path.
"Blood and Thunter: The Epic Story of Kit Carson and the Conquest of the American West" by Hampton Sides (Also on Audible). Southwest, esp. Taos, New Mexico area.
"My Antonia" by Willa Cather. Nebraska, 19th century settlers
"On the Road" by Jack Kerouac (also on Audible)
"Orchid Thief" by Susan Orlean (also on Audible). South Florida and the passion of orchid collectors.
"PrairyErth (A Deep Map): An Epic History of the Tallgrass Prairie Country" by William Least Heat Moon. Kansas -- 1 square mile of prairie.
"Refuge" by Terry Tempest Williams (Utah and the Great Salt Lake)