Nearly 400 trailers settle in at Birch Bay as part of Wally Byam’s Caribou Airstream Caravan, July 1967. A Caribou Airstream Caravan organized by Wally Byam resulted in nearly 400 trailers coming to Birch Bay during July 1967. Byam built the world’s first Airstream travel trailer in 1929, before founding the company Airstream in 1931, according to Airstream’s website. PHOTO BY JACK CARVER/COURTESY WHATCOM MUSEUM