Old Church, Delft (must see)

The Oude Kerk (Old Church), nicknamed Oude Jan ("Old John"), is a Gothic Protestant church in the old city center of Delft. Its most recognizable feature is a 75-meter-high brick tower that leans about two meters from the vertical. The Oude Kerk was founded as St. Bartholomew's Church in the year 1246, on the site of previous churches dating back up to two centuries earlier. The layout followed that of a traditional basilica, with a nave flanked by two smaller aisles.

The church possesses three pipe organs, from the years 1857 (main organ), 1873 (north aisle) and 1770 (choir). The most massive bell in the tower, cast in 1570 and called Trinitasklok or Bourdon, weighs nearly nine tonnes, and because of its strong and potentially damaging vibrations, is rung only on such special occasions as the burial of a Dutch royal family member in the nearby New Church. The massive bell is also sounded during disasters, when local air-raid sirens are sounded. This, however, does not happen during the siren's monthly, country-wide test, which happens every first Monday of the month.