The Monastery of Daphni is in Haidari, 11 km from the city center towards Eleusina.

In the premises of Daphni Monastery, the church of Dafneiou Apollo predated. It was right upon the ancient engraving of the Sacred Road that connected Athens and Eleusina, and thereby gave its name to the area. The new church was built in 5 AD, upon the ruins of the old temple, as the Christians used to. Actually, one of the temple's columns was used as a column in the new church that stands tall up until the present day.

In 1205, the monastery was plundered by the Crusaders and ceded to French monks. These were later expelled by the Turks and the Daphni Monastery was granted again to Greek Orthodox monks, but unfortunately was gradually deserted. The restoration work began in 1900, while the Daphni Monastery suffered several losses from the great earthquake in Athens in 1999.

The Daphni Monastery is a typical Byzantine monument and is distinguished by its unique architecture and unique mosaic decoration. All these elements contributed to the decision in 1990 that Daphni Monastery ought to be protected by UNESCO as a Monument of Cultural Heritage.