One of my favorite categories of thing is "guy decides to spend decades on an insane, idiosyncratic, solo art project of staggering scope". Other entries include the Watts Towers, Coral Castle, Forestiere Underground Gardens, Le Palais Ideal
this guy spent 21 years building a miniature version of nyc consisting of almost a million buildings, the full model is 50 feet long and 30 feet wide, and he first announced it on tiktok like this: