The Macquarie Lighthouse. Designed by convict architect Francis Greenway and constructed in 1818 (though there was a navigational aid on this site from 1791), it was Australia's First Lighthouse. This lighthouse was replaced by a similar structure in 1883; designed by Colonial Architect James Barnet. The crown is the most obvious change from the original (the tower itself is almost a copy) - allowing for a much larger, more powerful light source.
Barangaroo getting a bit of a facelift. Formerly an industrial area, it's currently being redeveloped as a mix of residential and public spaces. The future of the beautiful (and heritage-rich) terraces overlooking the area is uncertain.
The beautiful Taronga Zoo, officially opened on 7 October 1916.