The Spire of Dublin, also known as the Monument of Light, juts 390 feet (120 m) into the air above O'Connell Street. Constructed of stainless steel in the form of a pin, it was erected on the former site of Nelson's Pillar, which was bombed by Irish Republicans in 1966. During the day, it reflects its surroundings. At night, it is illuminated from within, shining light through 11,884 diode-sized holes.