What you're looking at here is the result of over 3000 hours of work and, insanely, two million pieces of LEGO. It's a recreation of Bag End, from The Hobbit/Lord of the Rings, and it's life-sized.
Well, sort of. Gandalf is as tall as everyone else, so maybe "giant minifig-sized" would have been a better label.
Life-Sized LEGO Bag End! [LEGO]