The Greek Parliament House (less known as the Old Royal Palace) is in front of Syntagma Square, in the heart of Athens.

The building was constructed between 1836 – 1847, in order to host the royal couple of Otto and Amalia. The palace (as it was called) was built to designs by the Bavarian architect Friedrich von Gaertner, while it was funded by Otto's father, King Ludwig I of Bavaria.

This is a three-story neoclassical building, rectangular in shape and huge, built primarily of marble, stone and wood.

The building ceased to be used as a palace and official residence of the royal family in 1910. From 1929 on, it became the seat of the Greek Parliament that was previously housed in the building at Stadiou Street , where today is the National History Museum. The building since then, now known as the Greek Parliament, has been the birthplace of Democracy in the city that the gave birth to the idea itself.

On the west side of the Palace of the Greek Parliament, is situated the famous Tomb of the Unknown Soldier.