As all the major places in Bonn were covered we decided to visit Bruhl.
Board the Metro(train no.18) from Bonn central station and it will directly take you to Bruhl Mitte within 30 minutes.
At a walking distance from here is the royal Augustusburg Castle. Although one is not allowed to take pictures inside you will surely enjoy and remember the beauty of the palace.
There's also a lovely garden to walk around and relax.
There are many restaurants and bars to have Lunch once you are done visiting it.