Kaarli Boulevard is a part of the circle boulevard surrounding the Old Town. It was constructed as a 2‑lane road in the early 19th century. Later on, after the completion of the Kaarli Church the boulevard was widened up to a 4‑lane esplanade and fenced in on the outsides by a low iron fence. In 1912 and after the trees were planted on two outer sides of the boulevard as well. Therefore, in some places the boulevard got 6 lanes, though, the majority of the outer trees have unfortunately become extinct by now due to the environmental pollution.