There are three government columbaria and 57 private ones. The larvae feed on "Knautia arvensis" and "Scabiosa columbaria". Many of the ancient city's olive presses, columbaria and water cisterns can still be seen. Like the other columbaria, this one employs "opus reticulatum". Benevolent associations often constructed the columbaria. The Roman necropolis consists mainly of arcosolium tombs and columbaria. Roman columbaria were often built partly or completely underground. The construction of columbaria within churches is particularly widespread in the Czechoslovak Hussite Church. The government-operated columbaria are at Mandai, Yishun and Choa Chu Kang. The columbaria at Vigna Codini are among some of the largest in Rome. The ashes of the cremated corpse are commonly stored in columbaria. The early columbaria were simple, with few aesthetic ornaments, just like early Singaporean housing flats. In 1964, two Columbaria (buildings to store cremated remains) called the Kyoto Gardens were constructed. In other cases, columbaria are built into church structures. As a result, columbaria can be found within some Catholic cemeteries.