Designed by Ernst Ziller in 1896, this beautiful Neoclassicist building used to serve as a royal residence before monarchy was abolished. It now serves as the seat of the President and official events are held here. The palace is surrounded by finely designed vast gardens.
The palace is not generally accessible to public.
Wikipedia https://en.wikipedia.org/wiki/Presidential_Mansion,_Athens
Official website (Greek) http://www.presidency.gr/?page_id=4464&lang=
Address Αθήνα 10674, Greece
Coordinates 37°58'19.396" N 23°44'26.805" E