Collective understanding.
From one island to another the questions arise towards the structures that share similar designs. The past has many mystery's that could provide an answer for the future... Getting it right is the hard part..
https://www.facebook.com/antony.tunstall/posts/10217851270772607
53°46'6.15"N, 166°59'16.87"W
53° 3'19.44"N, 169°44'39.85"W
both instances