Roof of the World: All Warehouse Buildings apply to Mountain tiles, but they cost increased Gold and Happiness Maintenance.
Gurkha: Unique Infantry Unit. Has increased Combat Strength and Movement, but costs more to train or purchase.
Sherpa: Unique Scout Unit. Movement and Sight actions ignore Mountain tile penalties.
Boudhanath: Influence Base. Increase your Relationship with all other Leaders. Must be built on a Tropical tile adjacent to a Mountain tile.
Highland Power Station: Unique Improvement. Increased Production and Culture. Must be built on a Mountain tile by a Sherpa Unique Scout Unit.
Diplomatic
Cultural
Mountains