Fuerte de Erlaitz

Fuerte de Erlaitz is an unfinished fortification located near the 497-meter summit in Irun, Spain, representing a failed military construction project initiated in 1891. Designed to accommodate 300 soldiers, it was part of the Campo Atrincherado de Oiartzun (Oiartzun Entrenched Camp) defensive system of which only three of seven planned forts were completed. Granite excavations visible on the mountainside mark the early halt of construction, while remnants from the Spanish Civil War—including a machine gun bunker from the post-war P line—can still be observed at the site. Today the incomplete fort remains accessible as part of hiking routes through the area.