Phoenixville, PA has some of the coolest covers I have seen so far. They have the phoenix in flames, Made in USA, and Established 1849.
It is an old steel town and one of few in the country that actually poured their own manhole covers. Many of the originals are along the main strip in town and they recently used the design in the new street scape. Cool little town if you are in the area.
Original Artwork made directly from a utility cover in Phoenixville, PA.