Sydney Open is one of the best things you can do in this town. Organized by the Historic Houses Trust every two years, the event allows access to more than fifty important Sydney buildings, many of them normally off limits to the public. A City Pass allowed access to dozens of building in downtown Sydney, as well as properties run by the Trust, which are well worth visiting at any time of year. I purchased a City Pass and planned my route carefully, like a marathon runner at a free buffet, to take in as much as possible, from sandstone Georgian to High Tech and beyond. The buildings covered virtually every period of Sydney’s post-1788 history, and present a golden opportunity for a cheap and cheerful romp through the history of the city’s architecture.