One of the reasons the Romans first colonised the area immediately to the west of the River Danube and established their regional capital at Aquincum (now part of Óbuda, in northern Budapest) is so that they could use and enjoy the thermal springs. There are still ruins visible today of the enormous baths that were built during that period. The new baths that were constructed during the Turkish period (1541–1686) served both bathing and medicinal purposes, and some of these are still in use to this day.