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There are 10 'show' caves to choose from, each tour 1 to 2 hours. Each cave is breathtaking and some are more strenuous than others. The Lucas Cave has about 900 steps, but includes the breathtaking Cathedral, and many other great features. If you're feeling less physically inclined, the Orient, Temple of Baal, Imperial, and Chifley Caves are pretty amazing, and a bit less physical. You can just turn up and join the next tour, or if you want to tour a particular cave, you can book ahead. Last day tour starts at 5:30PM. (Night tours are at 8PM.) Schedule changes between weekdays and weekends. Cave descriptions, tour times and prices are all on their website.