Mayday Hills is an abandoned lunatic asylum in Beechworth, Victoria. It was constructed in 1860. Tours are run daily (and nightly) but if you want to get into the most decrepit and run down parts of the building, you will have to break in. Like I did. I don't recommend it though, they have good security..
One patient jumped from a third story window over a packet of cigarettes. Another 'missing' patient was found decomposing in a tree after his leg fell off and was found by a dog.