There is big difference between Kathmandu and rest of other cities. These are pictures of Bhairahawa and Kathamndu. See the difference yourself.

Terai

Plain terai Land

terai city

Bhairahawa City

Kathmandu

Kathmandu

crowded ktm

As seen from Airplane

packed ktm

Chaotic Kathmandu: Full of crowd, unmanaged buildings and infrastructures