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We all played with LEGO as a kid. However, what were once deemed as “toys” have transcended mere playthings to become some of the most prized collectables to enthusiasts. Certain sets sit above others though, and in this guide, we shed light on some of the rarest LEGO sets around today.

Unfortunately, assessing the rarity of LEGO is not an exact science. Many of those at the top of the rarity scale are equally as rare as each other, which makes narrowing it down to a handful of the most elusive a very tricky task. However, factors like their estimated value, past sales, and their release date are a good indicator of rarity, as is whether a set debuted as a limited edition or not.

Bearing these factors in mind, we’ve picked out a handful of exclusive models that only the most dedicated collectors are likely to ever get their hands on. Seriously, don’t get your hopes up, some of these sets are out of this world expensive…

5. LEGO Cloud City 10123

There are many models that most collectors will struggle to ever get their hands on, but this 10123 Cloud City set is up there as one of the most difficult. Its price over the last 12 months, at least according to StockX, has consistently sat above £3,000, which makes it incredibly unattainable for most.

Part of the reason it’s so expensive is likely down to it including mini-figures of Darth Vader, Luke Skywalker, a Stormtrooper, Boba Fett, Han Solo, Han (Carbonite), Princess Leia, and Lando Calrissian; plus it comes from one of the most iconic scenes in the Star Wars franchise.

Star Wars LEGO is always popular, so it comes as no surprise to us that this one is up there with the rarest.

4. LEGO Castle 375-2

You’re probably wondering how on earth this simple "Yellow Castle" set is so rare. Well, that’s partly down to the fact it was released in 1978, but its exclusivity isn’t helped by it also only being released in Europe, the UK, Australia, and Canada.

Leaving the US out of the equation most likely meant fewer were made, and a shorter supply often leads to rarity. Its simplicity is also the key to its charm though, with the castle consisting of 767 pieces and 14 mini-figures in total. As a result, it’s an old-school set that collectors are seemingly itching to get their hands on to own a piece of LEGO history.

3. LEGO Airport Shuttle 6399

Released in 1990, the 6399 Airport Shuttle set is another retired classic whose price, if new, looks to be around the £4,000 mark on the resale market. That’s a hell of a lot, and prices most of us out of ever owning it.

Again, simplicity is part of this set’s charm, although it’s probably more complicated than you might think. The monorail actually moves, and there are 767 pieces to get your head around. It also comes with nine mini-figures and is, once again, another retro model that exceeds the usual rarity of LEGO.

2. LEGO Ultimate Collector's Millennium Falcon 10179

When you think of rare LEGO sets, the model that immediately springs to mind is most likely the Millennium Falcon. However, this is the Millennium Falcon collectors want to own from 2007, and it is renowned for its expensive price tag, both at retail and on the resale market.

Since it was retired in 2010 though, you’ll have to look for one second-hand these days, and that’ll likely cost you well over £1,000. However, you do get a hefty model in return, featuring 5,197 pieces and five mini-figures - that’s a lot, even to this day.

Its longer run and with it coming in multiple editions does mean it’s not the rarest LEGO set around, but it is certainly up there as part of the Mount Rushmore of elusive LEGO.

1. LEGO Moulding Machines 4000001

Any LEGO set released to the public can become rare, but exclusives, such as this Moulding Machine, usually become the rarest. This unique 4000001 set debuted in 2011 and was given to attendees of that year’s Lego Insider Tour, making it one of the hardest to get hold these days.

It’s said only 68 copies were ever made, with the set including replicas of the manually operated moulding machine from the late ‘40s / early ‘50s, and the automated one being used at the time of its release.

With so few ever made, and it being exclusive to those who were on a specific tour, it predictably costs well into the thousands of pounds second-hand. Many of us will likely never see it in person, and for that reason, it’s probably one of the rarest in existence today.

Rarest LEGO Sets

5. LEGO Cloud City 10123

4. LEGO Castle 375-2

3. LEGO Airport Shuttle 6399

2. LEGO Ultimate Collector's Millennium Falcon 10179

1. LEGO Moulding Machines 4000001

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