Lego is adding new sets all the time, and often I've been so excited to see what's new on the roster that I haven't given any thought to what might be being shunted into the great Lego brick bin in the sky, to make room for the new arrivals. Browsing the Lego website, I came across the 'Retiring soon' section and was appalled to see some of what I would consider absolutely classic sets there.Firstly, Lego Gringotts. The brick version of the Harry Potter wizarding bank has everything I'd ever want from a Lego set. The two-part kit includes the haphazard above-ground building — complete with goblins and Galleons — as well as the meandering and magical underground vaults, accessed via a rollercoaster train track. Oh, there's a dragon down there, too. This set is already sold out in the US.My second big surprise is that the Lego Mona Lisa is set to retire. If a bona fide masterpiece is up for the chop, then what is truly safe? Scroll down for 8 more sets that are on their way out — they're already disappearing from Amazon, but there's still time to pick one up directly from Lego before it disappears forever.In the US? Here are the the sets retiring soon in the USDon't miss it LEGO Gringotts Wizarding Bank – Collectors' Edition LEGO Dungeons & Dragons: Red Dragon's Tale LEGO Thunderfang Dragon of Chaos LEGO Lunar Outpost® Moon Rover Space Vehicle LEGO Mona Lisa LEGO Young Simba the Lion King LEGO Hagrid & Harry's Motorcycle Ride LEGO Mario Kart – Baby Mario Vs. Baby Luigi LEGO Dancing Groot LEGO Retro Radio