XKCD, as always, making the truth painfully obvious:
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As with a lot of the entrances to natural harbours and bays around Australia, Point Nepean used to be fortified. Here’s a disused rifle range from the air, taken just over the hill from the photos in my last post.
Rock arch known locally as London Bridge, just off the coast of the Mornington Peninsula National Park. Not to be confused with the formation with the same name further west along the coast of Victoria.
And a bonus shot looking south-east from above the arch: