A postcard from the Mayflower Hotel, Los Angeles from 14 March, 1957.
us-los.angeles-1957.03.14 by Mick Taylor, on FlickrLOS ANGELES / MAR 14 / ? PM / 10 / CALIF.
Postcard is in Danish, I think. The Pacific Coast Architectural Database notes that, "Danish-born artist Einar Petersen (1885-1986) painted a notable mural of Pilgrims for the hotel." Maybe that's why Anne stayed there.
