Martello Tower in Sutton, was truly a unique experience. First, you have to know that this is not in Dublin city centre (about 25-30mins away, 30$ taxi), but it was perfectly easy to go back and forth at all hours of the day, we had no problem. It situated remotely so you have no neighbors, just you, the tower, and the sea. Definitely would recommend staying here for a couple of nights when going to Ireland.