The Avengers Tower set comes with the entire OG Avengers crew, along with attachable clear pieces so you can pose Iron Man and Scarlet Witch fighting midair battles. The interior is six stories tall (minus the roof) and includes a fascimile of Stark's workshop. The exterior is composed of 271 windows, which you build individually. It's excessive, but gloriously so.

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There are some big Star Wars LEGO sets out there. This model of the massive Venator-Class Republic Attack Cruiser is over three-and-a-half feet long, and it captures the power of the Republic Army during the Clone Wars – a power that would one day be absorbed by the Galactic Empire years later. The model comes with a display stand and minifigures of Captain Rex and Admiral Yularen.

Close to three feet tall, Barad-dûr is one of the biggest Lord of the Rings LEGO sets. It's topped with a glowing fire eye, and spiky, intimidating architecture covers the entire structure from base to peak. Each piece of the tower slides and stacks onto the others, like a grotesque wedding cake. The model opens in the back to reveal numerous, detailed interiors, including a dungeon, an armory, and Sauron's throne room. We reviewed this set at the time of its launch; check out our We Build feature and photo gallery of the entire build process.

Scaled down to microfigure proportions, this recreation of Hogwarts Castle is over two feet tall and a little under two feet wide. In September 2025, it will have been 7 years since it first launched – an eternity in LEGO land, especially when some sets retire in under two years. It contains 27 microfigures, but the real treat, at least for Potter afficionadoes, are the four full-size minifigures of the Founders: Godric Gryffindor, Helga Hufflepuff, Rowena Ravenclaw, and Salazar Slytherin.

Rivendell is not only one of the biggest LEGO sets for adults ever made. It is one of the best designed and the prettiest, with elven architecture that looks too light and delicate to be real. From the iconic gazebo to the bridge over the River Brunein; from Bilbo's study to the Council of Elrond; there's so many movie references, so many cool little details for the discerning eye. Check out our review and photo gallery of this set.

Pokémon knew how to make a splash with its first wave of sets. This massive model of Venusaur, Charizard, and Blastoise is close to 7000 pieces. There is some scenery and set dressing, but the vast majority of the build is dedicated to making the three Kanto Starters as big and detailed as possible. You can pose them separately, or as a trio for maximum impact.

The oldest LEGO set on this list has been available for purchase since 2017 – a time when LEGO was just dipping its toes into the adult demographic. That it is still flying off the shelves is proof how timeless and bar-setting this set truly was and continues to be. Close to three feet long and two feet wide, the entire Falcon mounts on a stand that allows it to 'fly' at a dramatic angle.

This thing is massive and heavy; one should not build this set without reinforcing the shelf that it will eventually display it. It's fragile, and it would not survive a fall. The LEGO Death Star is six floors tall and nearly three feet wide. It contains a working elevator to all of its floors, which operates by the turn of a crank. It's an ambitious build, but it's also decadently expensive, costing close to $200-$300 more than the only two sets with higher piece counts.

The excessive piece count is almost the point of this set. The 'unsinkable' Titanic was the largest ship ever built when White Star Line launched it in 1911. It's best known today for its tragic sinking on its maiden voyage, in which 1,500 people died. But this four-and-half-foot long build remembers Titanic the way she was, with all her first class decadencies in tact. Check out our review and photo gallery.

The Eiffel Tower is composed of 10,001 pieces, which sounds terrifyingly expensive on its face. But it's actually $630 instead of the $1000 that conventional wisdom would dictate. Nearly five feet tall, with observation decks and elevators that run on cables, this is the biggest LEGO set by piece count in the company's history, beating even the 9,036-piece Roman Colloseum that retired at the end of 2023.

What's The Best Way To Get LEGO Sets On Discount?

LEGO piece counts and prices often go hand-inhand. So what's the best way to get expensive, big sets for cheaper?

First, join the LEGO Insiders program, which gives you points for every purchase that you make from the LEGO Store. Those points translate into money, which you can use towards the purchase of an expensive LEGO set. There are also select promotions – Star Wars Day, for example –where purchase of certain LEGO sets will garner double the points. So keep an eye out for deals.

Also, check Amazon, Walmart, Target, Barnes & Noble, and other places where LEGO are sold. Extra inventory, especially when a set's about to be retired, can often go for cheap. And these online and brick-and-mortar outlets often have specific days (Amazon Prime Days, for example) that offer deep discounts on sets that would otherwise sell at retail price.

Kevin Wong is a contributing freelancer for IGN, specializing in LEGO. He's also been published in Complex, Engadget, Gamespot, Kotaku, and more. Follow him on Twitter at @kevinjameswong.