[The keystone is missing in this arch]
Actually the whole structure is missing. This is a replica. A better term would be PORTAL.
PORTAL:
a doorway, gate, or other entrance, especially a large and imposing one.
synonyms: doorway · gateway · entrance · way in · way out · exit ·
PORTAL:
a doorway, gate, or other entrance, especially a large and imposing one.
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triangular shape relates to pix posted recently of site at unknow location speculated to be from NORK to antartica??
maybe a tie in to C_A facilites allegedly located in NORK?
just throwin spit balls?