The old clock tower located in the center of Sliven is one of the main attractions of the city. It was built in the XIX century and originally served as a fire observation tower. Upstairs were on duty that followed the fires in the city. The fact that, as in many other cities of Bulgaria, at the time in Sliven had many wooden buildings, so suddenly erupted and time unquenched fire could lead to dire consequences.

However, as a result of fire extinguishing technologies need to use the tower as an observation tower was gone. By order of the authorities at the top, the wooden part of the building with four sides have set the clock, which work today.

The building's architecture is quite simple, devoid of decorative elements. The main part of the building - a massive tower in the form of a quadrangular prism with thick walls. At its construction were used stones, bricks, and fastened with a plaster solution laid out in the form of alternating rows.

Above the tower stands a small octagonal wooden building with windows that looks like a gazebo. It covers vosmiskatnaya roof. At the height of the clock tower reaches 20 meters, so it is clearly visible from many points of the city.