The glass pyramid in front of the ²Ñü²Ô²õ³Ù±ð°ù shelters the ¸éö³¾±ð°ù²õ¾±±ð»å±ô³Ü²Ô²µ, the 3rd-century-AD remains of the Roman fort Constantia that gave the city its name. You'll only get a sneak peek from above, so join one of the guided tours that begin at the tourist office for a touch of magic as a staircase opens from the cobbles and leads down to the ruins.