With 500 taxidermied birds, jail cells from the 1800s, and a mysterious mannequin that’s been known to appear in the clock tower window (not an official exhibit, but a bonus), the Whatcom Museum in Bellingham, Washington, is a must-see. The museum spans three buildings: At the Lightcatcher, take in fine art and traveling exhibits, indigenous cultural displays, and bring children to the Family Interactive Gallery. In Old City Hall, wander the John M. Edson Hall of Birds and listen to their unique calls, learn about local Pacific Northwest history (can…