Tower of telegrafía óptica de Graja de Iniesta Monument · Graja de Iniesta, La Manchuela Conquense, Cuenca Surviving tower of the 19th-century Spanish optical telegraph network, also called La Mochuela, preserved in Graja de Iniesta, in the district of La Manchuela Conquense. It was part of the line that was to link Madrid with Barcelona via Valencia, built between 1848 and 1849 as part of a system that, through visual signals relayed from tower to tower, allowed a message to reach the last station from the first in just half an hour. The Madrid-Valencia line had thirty towers, from the Aduana de Madrid to the now-vanished convent of San Francisco in Valencia. These towers, staffed by telegraphists of military background, were built as fortified buildings, as can be seen in the one at Graja de Iniesta. Photo: 19Tarrestnom65 (CC BY-SA 4.0) What to see and do in Graja de Iniesta