 The Basilica of Saint-Remi, adjacent to it and consecrated in 1049, was its abbey church, and both buildings have been listed as part of a UNESCO World Heritage Site since 1991.The obscure origins of the great abbey at Reims lie in a little 6th-century chapel dedicated to Saint Christopher.The abbey's success was founded on its acquisition of the relics of St. Remy in 553; subsequently gifts poured in upon it from pious donors.