As a step towards cleaning the air, Boeri Studio designed these residential towers that are covered in various types of plants, shrubs and trees. This vegetation - apart from lowering the smog levels in the air - helps cool down the building in the summer and keeps it warm in winter. Although it's not accessible for the general public, you can still adore it from outside.
Wikipedia https://en.wikipedia.org/wiki/Bosco_Verticale
Address Via Gaetano De Castillia, Milan, Lombardy 20159, Italy
Coordinates 45°29'8.538" N 9°11'25.934" E