sentences:  In 1845, at the age of 26, he undertook to travel without his parents for the first time.It provided him with an opportunity to study medieval art and architecture in France, Switzerland and especially Italy.In Lucca he saw the Tomb of Ilaria del Carretto by Jacopo della Quercia, which Ruskin considered the exemplar of Christian sculpture (he later associated it with the then object of his love, Rose La Touche).