The Primary School in Batsi collects them for a Charity Organisation in Athens (Love for Life http://www.agapigiazwi.com/p/blog-page.html), who donates 1 wheelchair for 1 ton = ca. 540.000 of plastic bottle caps. In some supermarkets, shops and schools you can find collection containers.
Bottle Caps (Plastic)
STORAGE & COLLECTION POINTS
Special recycling containers for plastic bottle caps