The Cathedral of Athens, which is also called the "Metropolitan Cathedral of the Annunciation", is located in the heart of the Greek city of Athens, and its construction began on Christmas Day in 1842, and it is distinguished greatly from other churches because marble from 72 demolished churches was used to build its massive walls It took about 20 years to build, and inside there are the tombs of two saints killed by the Ottoman Turks during the Ottoman period, namely: Saint Philothei and Patriarch Gregory V.