(ODA Architecture via AP) An indoor waterfall is situated in a five-story high indoor forest filled with trees and plants at Changi Jewel Airport in Singapore. (Natalie Chin via AP) This photo ...

Once mature, these trees can reach an impressive 60 feet in height and 20 feet in width. These qualities make them ideal for homeowners who need lots of coverage, fast. Emerald green arborvitae, on ...