Coming soon: Singapore's Jewel Changi, the world's most awesome airport?

Images showing how the city state's Jewel Changi Airport will look when it's finished were released as construction got underway this month. They show impressive steel-and-glass biosphere-style structures filled with plants and a gigantic waterfall. If the finished product -- scheduled for completion in 2018 -- matches the proposals, it's likely to cement Changi's reputation as one of the world's favorite airports and a destination in its own right. The massive donut-like structure at its core will be 10 stories -- five above ground and five underground -- integrating airport facilities, with retail and leisure outlets. There'll also be playgrounds and a hotel. More than simply a new terminal, Jewel Changi Airport will be constructed on the site of the old parking lot fronting the existing Changi Airport's Terminal 1, and will be "seamlessly connected" to the existing terminals, according to the airport, CNN reports. Bringing nature indoors ... really Maintaining Singapore's reputation as the "garden city," Jewel Changi's centerpiece will be Forest Valley, a five-story garden with thousands of trees, ferns and shrubs. Commuters will even be able to take a hike up the valley. "We wanted to create a space where activities that were traditionally outdoors in nature are brought to an indoor environment," Robin Goh, Changi Airport Group spokesperson, tells CNN.

Cascading through Jewel's donut hole, in the middle of the forest, will be the 40-meter-high Rain Vortex. On completion, it'll be the world's tallest indoor waterfall, according to the airport. At night, the Rain Vortex will transform into a light and sound show. Four different gateway gardens will feature unique landscape elements. The North Gateway Garden, for instance, will use the trunks of rain trees recycled from the airport's old open-air parking lot. On the top level, Canopy Park will have gardens, walking trails, playgrounds and eateries spanning approximately 13,000 square meters. "We envisaged an area that comes with big sprawling spaces and play activities," says Goh of Canopy Park. "We wanted to create a place where visitors can simply relax and have fun with their families and friends."