A revolutionary ski slope was built on top of a 462,848-square-foot waste-to-energy plant within the city of Copenhagen. Reaching 279 feet in the air, the slope is made out of a synthetic “dry skiing” surface known as Neveplast. A previous Olympic athlete, Chemmy Alcott, says the slick surface feels faster than snow. There are other activities on the giant slope, such as hiking and a CrossFit trail. Wild strawberries, plants, and even animals have been found to inhabit the hill. The world’s tallest climbing wall is also set to open on the side of the building in the spring.