Kathmandu is Nepal's capital and largest city, situated at an altitude of around 1400m. I have visited Kathmandu 10 times over the years. Kathmandu gets more modern each time I visit, a little more polluted, the t-shirts change, but the basic city stays the same. I love it. The immensity of the Kathmandu Valley is evident as you fly into Tribhuvan International Airport, with Kathmandu stretching into the Himalaya mountains on the horizon.