More of a circle than a square, this star-shaped roundabout was originally part of an 18th-century urban route leading to the nearby Ujazdowski Castle and Łazienki Park. On the right here is the handsome Jasieńczyk-Jabłoński tenement (Mokotowska 12), erected in 1910. Upon completion, it was not only one of the most modern but also the tallest residential building in Warsaw (38 m).