The Basilica of Saint Servatius is the oldest church in the Netherlands, founded in the 4th century over the tomb of the city's first bishop. What stands today is a magnificent Romanesque and Gothic structure built between the 10th and 13th centuries, with a powerful westwork that anchors the south side of the Vrijthof. The interior is dark and weighty, built to impress on the scale of a cathedral rather than a parish church.
The real draw is the treasury. The Schatkamer holds the Noodkist reliquary, a collection of episcopal vestments, and a wealth of medieval silver — one of the richest church treasuries in the Netherlands and a serious rival to those in Aachen and Cologne. The crypt beneath the basilica contains the sarcophagus of Saint Servatius and is one of the oldest surviving church interiors in the country. Open daily; the treasury has a separate entrance fee.