"Long Forgotten" places

A short, relevant, title eludes me but this Topic is about locations/places you have passed regularly in your lifetime that you did not know until much there was interesting history attached to it.

For me it was the headquarters of Carrol Shelby’s “School of race car driving” in Santa Fe Springs. For years I used to do business with a company in Bell Gardens and without even knowing it I had passed the location in Santa Fe Springs on E Florence Avenue. From La Habra to Bell Gardens using Florence was the best route.