Acueducto Viaducto de los Arcos should be on the must-see list of any history buff. Ask about tours or simply admire the exterior of this incredible structure from out the front.
When you've finished up at this Old Town Teruel historic landmark, why not check out Dinopolis Museum, Teruel Cathedral, and Torre de El Salvador? They're not far from Acueducto Viaducto de los Arcos and also a hit with tourists.