Historically, the Kathmandu Valley encompassed three separate kingdoms; Kathmandu, Bhaktapur and Patan (also known as Lalitpur). These cities have grown together and presently form one mega city. Each of these three entities boasts its own Durbar Square (meaning royal square); all of them a tribute to the local history and magnificent architecture.
Unfortunately, the big earthquake in 2015 and its aftershocks have damaged some of the temples. Although they are in the process of being reconstructed with great care, this will take time. Nevertheless, each Durbar Square is still a sight to behold that never ceases to amaze me.