Mulhouse is called the city of the Bollwerk, which is the name of the tower of the city, a relic of its old fortifications. Mulhouse is the capital of technical museums. Its Automobile museum has 500 vehicles and is known across the world. Its Railway museum has the largest collection of railway equipment in Europe. Every year in February, Mulhouse holds its international carnival. For several days, thousands of revellers from all walks of life enjoy shows, cavalcades and typical evening festivities. As in many other towns of Alsace, Christmas plays a big part in the life of Mulhouse. The Christmas market is a truly magical. Enjoy the Mannala, a roll made in the shape of Saint Nicholas.