Image source: Inhabitat
In 2012 there was a green living wall with over 44,000 plants spanning 13,600 square feet of wall area in Milan, Italy and it was declared the largest by the Guinness Book of World Records until South Korea came up with another world record with Seoul City Hall (over 70,000 plants spanning 16,300 square feet) . Now in London we have a green living wall covered by over 10,000 plants spanning more than 3,700 square feet of vertical surface area. This surely is one of the largest green walls around the world.
Image Source: Seoul Metropolitan Government
If you are looking for more green wall inspiration, you should check this out and be amazed by what you have seen.