https://www.geocaching.com/geocache/GC4AYDM_25-rota-da-levada-de-canadelo
GC4AYDM #25 - Rota da Levada de Canadelo (Traditional Cache) in Porto, Portugal created by Callaeci
Geocaching is a treasure hunting game where you use a GPS to hide and seek containers with other participants in the activity. Geocaching.com is the listing...