The Old Palace is now the headquarters of the Greek Parliament. This neoclassical building, designed by the architect of the Bavarian Royal Court of Bavaria, Friedrich von Gaertner (Gärtner), located in Syntagma Square in Athens. Used as a palace of King Otto of Greece and then the King of the Hellenes George I, until 1910 when moved to a newer, on the road of Herodes Atticus, hence the name of such Old Palace. On the west side of the building is the site of the Tomb of the Unknown Soldier, while the exteriors of both, the east and the south side, of the principle, reached the large national garden, created and decorated with care of queen Amalia, wife of king Otto
(some of these informations from Wikipedia).