CHANGI AIRPORT TERMINAL 4, SINGAPORE
Investors have attempted to green the Changi Airport to bring the most comfortable space for passengers who have experienced a long and exhausting flight. Trees are planted throughout the airport campus; they climb straight up to the buildings' highest floor.
This effort is significantly useful. As a result, the number of visitors coming to the airport increases annually. This area also becomes the prior and favorite check-in place for many tourists coming to Singapore.