Mariposa County, US
The Mariposa County Courthouse in Mariposa, California was built in 1854, making it the oldest courthouse in California. It was listed as a California Historical Landmark in 1977. The two-story building is still in full use as a courthouse to this day.
Listen to the audio guide for Mariposa County Courthouse Free on WIP — starts by itself when you arrive, even with the screen off