You can easily miss these, mixed in among the standard pay viewfinders along Alki Beach. But these are magical: When you look through them, a historical photograph from this place is superimposed over the actual view, hovering like a ghost. There's a canoe paddled by Duwamish folks on this water. There's a bunch of horseshoes dangling, used to take early soundings here. There's the Joy Wheel ride at night at Luna Park, the amusement center on this land in the first years of the 20th century—until it was destroyed by arsonists. Plaques on the ground explain; the sun above powers the projections. And you thought you'd seen all the great public art in Seattle. (The waterfront from Alki Beach to the Duwamish River, daylight hours, free)