and golden cross topping six hills in dark blue. The church refers to the name of the city. The six hills are based on the coat of arms of the Barrens of Swarzenberg. The arms is based on the oldest known seal from the 13th Century and was given to the city on 5 May 1976. Old coat of arms Between 1634 and 1976 the city used a coat of arms without the six hills. This arms had a blue and green background above and below the depicted double towered church, the right and left lined with two silver trees. Shown at the bottom of the coat of arms were three more silver trees. Sights The Catholic Church St. Magarethen The ruin of the Kastelburg The market place with the town hall Elztalmuseum, many examples of the mechanical organs built in the town Twin towns – sister cities Waldkirch is twinned with: Charleroi, Belgium Chavanay, France Liestal, Switzerland Sélestat, France Worthing, England, United Kingdom Economy and Infrastructure Waldkirch has a long history of industry and craftsmanship. The tradition of gemstone cutting, which reaches back to the Middle Ages, is still upheld today by the Wintermantel company. Organ building in Waldkirch, first established by Matthias Martin in 1799, grew to include barrel organs and orchestrions in the 19th century, gaining worldwide renown well into the 1920s. The organ builders Jäger and Brommer, Paul Fleck Söhne, Achim Schneider and Wolfram Stützle continue the tradition to this day. During the industrial revolution, Waldkirch - along with the entire Valley of the Elz - was an important location of the textile industry. Of this tradition, all that remains today is the Gütermann company in the neighboring community of Gutach. In contrast, optical and electrical manufacturing, represented in Waldkirch by the company SICK AG, has been enjoying steady growth since World War II, as has paper manufacturing represented by the company August Faller GmbH. Since 1877, a successful viticulture has been established in the district of Buchholz, which is also known trans-regionally for its cultivation of fruit and berries. In the district of Suggental, several silver mines were in use during the Middle Ages. Some parts of the mines are being uncovered and made accessible again by the mining research team Suggental, and tourist visits can be arranged ("Silberbergwerk Suggental"). Tourism is another important economic sector for Waldkirch, which is located alongside the German Clock