If you're reading this article, then I don't need to tell you just how valuable some LEGO sets can be. It's true; some LEGO sets are highly collectible, making them either incredibly rare, incredibly expensive or a combination of the two.

In fact, some sets are so collectible the chances of you even seeing them, let alone playing with them, in your lifetime is highly unlikely and these sets can fetch as much as 500% or more over their retail prices. So what are those sets you’d ask? In this article, we're going to show you our top 5 most collectible LEGO sets ever made by LEGO.

1. Ultimate collector’s millennium falcon: this piece remains the biggest Lego set ever created by Lego with a 494 pages instruction pamphlet and over 7200 bricks to assemble, this bad boy would take none less than 20 hours of your day if you plan on assembling.

Loved by all Star Wars enthusiast, the size is breathtaking. It’s a complete replica of the Falcon jet in the Star Wars movie, no details were left out, this Lego set is one of the rarest pieces ever produced, which makes it extremely valuable for collectors.

Released in 2007, this piece had a whopping price tag of $499! Wait till you hear how much it now sells for, if you were lucky to get your hands on one of these babies when it launched at its original price of $499, then you should be smiling to the bank, because right about now, it’s being sold for $5299 and even $10000 on some sites, insane profit you’d say. Who says there’s no gain in collecting Lego bricks?

2. Lego creator carousel: released in 2009, with over 3200 blocks and 2 instruction booklets, this whirly plaything sure made the hearts of carousel aficionado skip a beat.

But there’s something mysterious about this piece, it was sold for $279 during its release, and despite the backlash the piece received, for being too finicky to put together, this adorable set now commands as high as $1670 in the secondary market.

3. `4x4 Crawler Exclusive Edition: its reputation precedes it, just like its name, this monster truck weights close to 6.5lbs, having an instruction manual that spans over four booklets and over 1,500 bricks to assemble. Although assembling the 4x4 crawler isn't complex, but assembling it is time-consuming.

This sturdy beast is designed like the Dakar trucks we see on TV, the kinds that seamlessly surf the Arabian Desert. With a balanced suspension on each wheel, having two independent motor engines, delivering a precision of torque on each axle of the truck wasn’t hard to achieve.

With its announcement in April 2013, Lego produced only 20,000 copies of this Monster truck, making it insanely scarce, it sold out within a day at the parallel retail price of $199.99; collectors had to lobby in the secondary market to lay their hands on a piece.

Prices on eBay went berserk! From $199.99 to $840, having a dedicated plate number was another jackpot for the lucky ones who had one of these toys, one with a “1 of 20,000” plate number would sell $70 higher than a “15,778 of 20,000” plate number.

4. The café corner: popularly known as the CC, released in 2007 with over 2,000 bricks. Usually, modular building Lego sets takes an average of 2-3 hour max for someone who knows his onion, however, with the CC, even if you’re the smartest AFOL (adult fan of Lego) out there, to assemble the CC, you’d have to dedicate more than twice the usual time that’s needed.

The CC was designed because of collaboration between Lego fans and official designers; this town themed edifice is graced with a lot of bright colors and a majestic façade. With its modular aesthetic, this piece is a beauty to behold.

The majestic CC sold for a paltry sum of £89.99, compared to £2,096 which it now sells for on eBay and other major brick auction sites, so if you’ve got a piece of this with you, well, need I say further?

5. The Taj Mahal: second to the Millennium Falcon, this elegant edifice has over 5000 bricks that will take you as many as 15 hours to construct successfully, even the real Taj took over ten years to be erected.

Released in 2008, the huge Lego set takes us to the Asian ambiance, to admire one of the most beautiful architectural stunts ever pulled by humanity, the Taj Mahal is built in honor of Emperor Shah Jahan’s wife, Empress Mumtaz Maha.

Original retail price as at the time of production was just $299, now to get your hands on a Taj Mahal that’s in pristine condition; you’d be coughing out as much as $2000, bunkers!

6. The statue of liberty: made of 2899 bricks, released in the year 2000, this stunning Lego set is the mini replica of USA’s most famous monument.

Fun to build, stands over 2 feet (9”) tall without any pedestals, this model was the first Lego set to be made of sand-green bricks, it no wonder its asking price in the secondary market goes as high as $1200 for a set in pristine condition, that’s a staggering thousand dollar profit compared to its original retail price of $199.99 during its release.

Looking for a set?

If you’re looking for one of these kits, it pays to do your research. Contact a reputable Lego store that can often assist with finding unique sets like the ones listed above. It’s true, if you want to get your hands on one of these sets it’s often not what you know but who know you.