The Propylaea
When walking upwards to the Acropolis, people can see the imposing entrance of it, called Propylaea. It started being built by the architect Mnesecles in 437 BC but it was interrupted in 432 BC due to the Peloponnesian War.
The architect of the Propylaea managed to discipline the slope ground on which he constructed the entrance of the Acropolis. It consisted of six Doric order columns on its front part making it look like an ancient temple. The marble roof of the entrance was supported by six Ionic order columns located in the internal hall of the constructure. The north side consists of a chamber that was used as a Gallery during ancestry while the south part was similar yet empty; its usage was limited to the symmetry of the entrance.