Apparently, there is also a man made cave under the Sydney Opera House. In 2017, an art exhibit was held there. Those attending the "exclusive event" were given a security pass code on their phones in order to gain entry. The photo in this article is rather creepy.
https://artrack.com.au/blo...
https://artrack.com.au/blo...
01:14 PM - Dec 30, 2023
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