Quarries and marble on the slopes of Hymettus

The rocks of Hymettus include limestone, schist and large masses of marble. On the western side of the mountain there were quarries where marble was extracted.

According to the Greek Wikipedia, this marble was used to build monuments in Hellenistic and Roman times.

A quarrymen's hut with its roof

On the western slopes an ancient quarrymen's hut survives. It is one of two buildings in ancient Attica that still keep their roof, as the English Wikipedia notes.

Sources: Wikipedia (Greek and English), article Υμηττός / Hymettus.