(Yes i play acnh) This is what i call "Museum Hill" It took over 17,000 Poki (DLC currency) for the big flower on the right, a LOT of terraforming, some DLC glowing moss harvesting and crafting, 126,000 bells (for the ramp), and about another 1,500 or 2,000 bells for the natural flowers. You can't see it in this picture but there's another waterfall behind the museum.
nintendo khinsider for the music nintendo owns the music