We visited the Kuala Lumpur City Gallery and going to the gallery is free. This is the source of information of the history about Kuala Lumpur. The gallery is operated by ARCH Collection Sdn. Bhd.
You can see the following photos of the miniature models of the gallery, Jamek Mosque, the future of Kuala Lumpur, and Dataran Merdeka.
I was able to buy some t-shirt too.
The opening hours is from 8am to 6pm daily.
More photos on Flickr.