Jam Gadang is the name for the clock tower located in downtown Bukittinggi, West Sumatra, Indonesia. This clock tower has a clock with a large size on four sides so called Jam Gadang, Minangkabau terminology meaning "big clock".
In addition to being a central marker of Bukittinggi, Jam Gadang has also been used as a tourist attraction with the expansion of the park around the clock tower. The park became a community interaction space both on weekdays and on holidays. Common events are usually held around the park near the clock tower.
Jam Gadang has a basic floor plan of 13 x 4 meters. The interior of the 26-meter-high clock tower consists of several levels, with the top level is the storage of pendulum. The pendulum was broken until it had to be replaced by the earthquake in 2007.

There are 4 hours with a diameter of 80 cm each in Jam Gadang. The clock is imported directly from Rotterdam, the Netherlands via Teluk Bayur port and is mechanically driven by a machine made only 2 units in the world, the Jam Gadang itself and Big Ben in London, England. Clock and clock machine are located at one level below the top level. At the bell is the watchmaker Vortmann Relinghausen. Vortman is the last name of the watchmaker, Benhard Vortmann, while Recklinghausen is the name of a town in Germany where the clock machine was manufactured in 1892.
lime, egg white, and white sand.

The construction of Jam Gadang cost about 3,000 guilders, which is a fantastic cost for that time. So since it was built and since its inauguration, this clock tower has become the center of everyone's attention. It also causes Jam Gadang then serve as a marker or landmark and also the zero point of Bukittinggi City.