You'll find oil lamps burning in Hindu and Buddhist temples throughout India, Nepal and Tibet. In these cultures fire is a symbol of transformation, for Hindus the cremation after death is a transformative process.
Kathmandu, Patan & Bhaktapur were once separate kingdoms, rivalry led them to compete to produce the best architecture, resulting in some of the best on the Indian subcontinent.
This was written before trekking in Mustang, between the villages on the old trade route between Tibet and Nepal that was used for hundreds of years by caravans of sheep and goats carrying salt and wool.
Puja Meditation, Ritual Puja (literally an offering) is an important aspect of Hindu and Buddhist faiths. In Buddhism it can be part of a Meditation Ritual on one of the Bodhisattvas or Buddhas.