The US Coast Guard built Lime Kiln Lighthouse on the western shore of San Juan Island in 1919, replacing an earlier light built there in 1914. The last major light built in Washington State, it was declared a Historic Site and listed on the Washington State Heritage Register and the National Register of Historic Places.
Now part of Lime Kiln Point State Park, it hosts interpretive programs on orca whales, which are often seen just off-shore.