The Monastery of Penteli is a historic Greek Orthodox monastery located on the slopes of Mount Penteli in Attica, Greece. Founded in the 16th century, it is dedicated to the Assumption of the Virgin Mary and has played a significant role in the spiritual life of the region. The monastery features beautiful Byzantine architecture and houses a collection of religious artifacts. The monastery is also known for its stunning views of the surrounding landscape, including the city of Athens and the Aegean Sea. It remains an active religious site, attracting visitors and pilgrims who come to admire its serene environment and rich history.