One of the first things that caught my eye, was this rusty old bike, recycled as a planter box:
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Across the street from that, this formal garden, complete with a Native American sculpture by famous Maine sculptor, Jud Hartman:
A little ways up the street from that was the Pentagoet Inn: 
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It wasn't a very pretty day unfortunately, but the view must be just incredible when it's sunny. I loved this shady sideyard with a view of Castine Harbor, too: