When you next visit the One World Observatory at the top of the One World Trade Center in New York City, you might notice a unique smell in the air. …the observatory has started pumping a custom-made scent aptly called “One World”. The scent has been designed to resemble trees native to New York including beeches, mountain ashes, and red maples but, as The New York Times reports, not everyone is a fan. Nevertheless, it seems somewhat appropriate that the observatory’s aroma is reminiscent of the natural world given that One WTC has become a beacon of sustainable architecture. …As of September 2016, One WTC became the tallest building in the western hemisphere to be awarded a LEED gold certification. …As much as 50% of the wood used in the buildings of the new World Trade Center was sourced from Forest Stewardship Council-certified forests.