One of the more impressive and enduring LEGO sets for adults (well, ages 16+, anyway) is the LEGO Ideas Tree House. It's a massive three-unit tree house you can build with either green leaves or yellow leaves for an autumnal feel. It normally rings in at $250, but it's on sale for $75 off for Prime Day. Grab it before it's gone.

We've tested countless Lego sets and rounded up the best last Amazon Prime Day Lego sets still live after the sales event came to an end..

LEGO x Nintendo’s The Mighty Bowser is still the biggest LEGO set in Super Mario lineup to date with a whopping 2,807 pieces. Even the recently released LEGO Mario Kart Standard Kart set can’t compete.