Not far from where I was staying was the entry to the oil storage tunnels built during World War II. This time of the year may be humid and hot, but it keeps the majority of tourists away. I had the space to myself for most of my visit. The tunnels were built after many of the oil tanks were destroyed in the Japanese bombing of Darwin in 1942. The cost blowout was enormous, they started to leak, and all the planned tunnels were never finished. In fact they were not used for the war, and later in the 1950s, when used to store diesel for airplanes, there was bad leakage so they were never used again.
You can walk the length of the largest tunnel, and along one wall are lots of historical photos. The name of this inn is self-expalantory