https://www.geocaching.com/geocache/GC1F68F_grutas-de-mira-de-aire
GC1F68F Grutas de Mira de Aire (Multi-cache) in Leiria, Portugal created by Mike n Maggie
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...