The Oplenac (OH-pleh-nahts) Royal Mausoleum is the historic place of the mausoleum of the Serbian Karađorđević Royal Family and is located in central Serbia near the town of Topola. It is known for the St. George Church, which is decorated with superb mosaics like the ones in this photo over just about every square inch of its interior. The floors are of various-colored marble, in geometric designs. The church and mausoleum were the works of Peter I who, upon assuming Royal Duties in 1903, chose a spot 337 metres (1106 ft) on the top of Mali Oplenac hill for the location of his Church. The location was measured by experts so that the altar would face east, according to Orthodox tradition. In 1904 the cornerstone was laid, and the Charter dedicated to St. George was placed in the foundation.