On the list of best public facilities is the Trail Restroom in Austin, Texas, which was designed by Miró Rivera Architects in partnership with the city of Austin. Located on the Ann and Roy Butler Hike–and–Bike Trail at Lady Bird Lake, Cintas praised the restroom's use of sustainable materials that blend with the surrounding natural area and its maximizing of airflow -- always important in a public restroom.
Looks like it's near Austin. It's spectacular when you consider that it is on a hiking trail.