The Tongeren Basilica, built in Gothic style in the 13th century, where recent excavations have produced some of the richest archaeological finds in Flanders. Archaeological excavations have proven the presence of an edifice here starting from the 4th century, while a Carolingian prayer house existed here in the 9th century. The building of the choir of the present basilica began in 1240. Nave, transepts and side chapels were added between the 13th and 15th century. The original Romanesque tower was replaced by the present, 64 m-tall Gothic tower from 1442 until 1541. The basilica's interior is home to the statue of Our Lady of Tongeren, erected in 1475. The treasury is housed in the former hall of the Chapter and comprises one of the richest collections of religious art in Belgium.