Ainsa is a fine example of mediaeval urban development. You will spend the night amongst a dense and harmonious ensemble of period houses, close to whom is the elegant tower of La Collegiale and the enormous castle, the castle is a big as the whole village! It is the perfect place from which to set off to explore the Ordesa canyons.
Also to see in Ainsa : the Plaza Mayor, the remparts, the square tower, the Romanic church of Santa Maria.