Rome became a major destination for Christian pilgrims as it was easier to access for European pilgrims than the Holy Land. Constantine erected great basilicas over the tombs of Saints Peter and Paul. A distinction of these sites was the presence of holy relics. Over the course of the Middle Ages, other religious structures acquired relics and became destinations for pilgrimage. In the eleventh and twelfth centuries, substantial numbers of pilgrims flocked to Santiago de Compostela in Spain, in which the supposed relics of the apostle James, son of Zebedee, discovered 830, are housed. Santiago de Compostela remains a significant pilgrimage site, with around 200,000 pilgrims, both secular and Christian, completing the numerous pilgrimage routes to the cathedral in 2012 alone.