They are mainly designed to conduct racing events. The comprehensive list of which can be seen here.
Volcano and magma river
Vegetation area and Snowfall area (seasonal)
Lake and Dam with hydraulic power plant
Tunnels, Wood and Rope bridges, Concrete bridges
Map will end by using impossible to climb cliffs, volcanic blast and bad weather
Features
Whatever one wishes to do in real life but is too afraid to do or cannot do due to the physical constraints in reality, they can do in the mountain terrain in the metaverse
Physical distances become null and void, while sitting in India you could take a tour of the Eiffel Tower for instance via the virtual experience
NEW constructions can be also be made in the mountain terrain to try out new experiences and discover what actually works or doesn't.