The Hiram M. Chittenden Locks connect Puget Sound to Lake Union and Lake Washington, and watching boats rise and fall in the lock chambers is hypnotic in a way you don't expect. The real draw, though, is the fish ladder — an underwater window where you can watch salmon fighting upstream during the summer runs. Free, fascinating, and weirdly moving.
Insider tip
Visit between June and September during salmon season. The fish ladder viewing window is underground — follow the signs past the botanical garden.
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