Pine Gap
Sticking with Australia, the US has a second secret base. Hidden in the desolate outback is a joint facility that is one of the most important US military bases outside of America, used in both surveillance and military applications. It’s also partly run by the CIA, NSA and probably a whole host of other letters of the alphabet.
Built during the Cold War to keep an eye on Soviet missile testing, it now keeps it’s eyes on the Middle East and Asia and it’s assumed that the majority of spy satellites for the US are controlled from here.
Gotta love that secret stuff.