The Red Canyon of Teruel, popularly known as the Aragonese Colorado Canyon. An incredible place very close to the city of Teruel and very little known, as you are unlikely to find anyone else on those trails. It is also known as the Rambla de Barranchina. The circular hike is quite easy and goes through the mentioned ravine before taking you up to the top of the canyon for the return. You will also find some civil war vestiges along the rim of the canyon. The most spectacular views will await you towards the end of the route, when you go back down and get to see these vertical walls up close.