This cache is a metal "bison" container hidden at the junction in Amygdalo.
After you've found it, you could follow the directions on the signpost to two of Syros's main archaeological sites, which are also the hiding places of geocaches. At Grammata Beach you can have a swim and see the ancient graffiti left by storm-stranded sailors, and at Kastri, you can visit the remains of a 5,500 year-old village high above the sea.
W (a.k.a. DidianRay)