What are the hidden structures located on Ostrov Oktyabr'skoy Revolyutsii?

It looks like whoever attempted to hide these structures employed the Saga Genesis graphics to cover-up something to the north. One structure is obviously an artificial formation (as in an unnatural formation that was built by an intelligence), as it is perfectly round, roughly 25 miles in diameter, and appears to be very tall- perhaps over a mile or so. The details of the island have been changing within the past 24 hours that I have observed it. I hope that others can see it as it is now before the geographic depiction is redesigned.