Goslar has a rich history cultural, political and industrial history. Salian Emperor Henry I founded the town in the 10th century after the discovery of silver deposits in the nearby Rammelsberg. The wealth derived from silver mining brought Goslar the status of an Imperial City, which attracted the interest of the Holy Roman Emperor. The medieval Imperial Palace (Kaiserpfalz Goslar) was built in the 11th century and became a summer residence for the emperors, especially Henry III of Germany who visited his favourite palace about twenty times. Henry's heart is buried in Goslar, his body in the family vault in Speyer Cathedral. Goslar's medieval cathedral was built at the same time as the medieval Imperial Palace, but only the porch survived; the cathedral itself was torn down in 1820. Other sights are the town hall (16th century) and the ancient mines of the Rammelsberg, which now house a mining museum.