It is not a specific location but the entire city can be called as one open air art gallery. Mandawa in the ancient days became a popular stoppage for merchants crossing over through the silk route.
As some of them settled down in the region, they constructed for themselves and their families, huge mansions (Havelis). These havelis were not only huge and designed beautifully, they also adorned fresco and were decorated with beautiful paintings. With the coming of Britishers, as this city was occupied by them, it saw the way of contemporary art which was more or less like the traditional Indian art form, over time, the world saw the amalgamation of two art forms and Mandawa for its palaces, designs, architecture and frescoes began to be popularly mentioned as the Open Air Art Gallery.