I treasure UNESCO World Heritage sites, this one was one of my favorites though all are…read moreunforgettable (https://whc.unesco.org/en/list/518/). Well preserved Cistercian abbey is an expansive 3 enclosures built from the 12th through the 15th centuries. As amazing as it is, it's not over run with tourists, in some rooms and spaces I was all by myself and it was easy to pretend I was a time traveler. Don't miss the great alabaster altarpiece by Damia Forment (1529). You will also find the tombs of Aragon and Catalonia royalty from the 13th and 14th century. An easy day trip from Barcelona, it is not to be missed, it is incredible. Also, it has one of the best gift shops of any tourist site I've been to.