Kathmandu valley, the capital of the country, is the entry point for all the guest travelling by air.  Steeped in history, it also is one of the most interesting and popular touristy city in the country with the numerous sites of historic and cultural interests.  The valley boasts 8 UNESCO heritage sites within a very small span.  Its main three cities are packed with exquisite expamples of Malla era art and architecture rendering its palace squares as open air museums.  One can get lost in the city for days, and yet have something for the next time.