The exhibition in the Belgian town of Waterloo marks the 200th anniversary of the famous battle which saw Napoleon defeated by British and Prussian forces.
Called "History in Bricks" it features scenes from Napoleon's life up to the famous battle in 1815 plus a Lego replica of a painting and his famous tricorne hat.
"We wanted an event that would cross generations. Here even the youngest can look at these pieces of history and understand their origins, while having fun," Eric Jousse, the curator of the exhibition, told AFP.
The centrepiece of the exhibition is a giant model of Les Invalides, Napoleon's final resting place in Paris, which required 274,000 bricks and took 1,000 hours to construct.
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It stands 2.5 metres (about eight feet) high and weighs 500 kilos (1,100 pounds).
There are also key scenes from Napoleon's life including his wedding, the Arc de Triomphe in Paris and the famous Lion's Mound, the grass hill topped by a statue of a lion which was constructed at the site of the Battle of Waterloo.
It also features a giant reconstruction of the portrait "Napoleon Crossing the Alps" by the French painter Jacques-Louis David and a version of the distinctive black three-pointed cap that Napoleon wore.
A series of events including a commemorative ceremony and two days of battle reconstructions are scheduled around the anniversary of the battle on July 18.