One of the lesser known attractions in Macau that I like to pass by and have a look at from time to time is the Chinese Pavilion Library in front of the San Francisco Garden, very near to Grand Lisboa Hotel.
This is an octagonal-shaped pavilion that serves as a public library for local residents. Built in the 1920's, it is charming little place to see. You can enter and take a quick look around during opening hours. Nobody minds. Otherwise, simply enjoy from the outside when passing by.
In the end, the Chinese pavilion, because it is not a World Heritage attraction, receives very little tourism promotion and almost no visitors yet it is located just 5 minutes walk from the Macau World Heritage area and can be conveniently seen for anyone with interest in interesting architectural buildings