6: Kirtipur :-
Kirtipur is definitely a much less popular destination than the ones mentioned so far, so much so that during my afternoon walking the streets of Kirtipur I didn't meet any other tourists.
The city is located just 5km from the center of Kathmandu, the old part is perched on top of a hill where traffic is practically absent and limited to a few scooters, all sites of interest are free to enter. It is a great way to get to know ancient Nepal, far from mass tourism but a stone's throw from the capital.
Half a day is more than enough to explore the city: the main sites of interest are the Tri Ratna temple, Dev Pukko (city center with the Queen's palace attached), the Bagh Bhairab temple and finally the Uma Maheshwor temple. Walking and getting lost in the streets of the ancient city is in itself really interesting and a great way to spend a couple of hours.
Finally, before returning to Kathmandu I strongly recommend eating at the Newa Lehana restaurant, where excellent traditional food is served and the quality is definitely excellent, so much so that many locals visit Kirtipur exclusively to eat here.
Reaching Kirtipur is really easy, buses leave frequently from Ratna Bus Park and take about 25 minutes to reach Naya Bazaar at the base of the ancient city, 20 rupees.