The Wellington Museum occupies the inn on the Chaussée de Bruxelles in the town of Waterloo itself where the Duke of Wellington spent the night before and after the battle. The building has been preserved as a museum and gives an intimate sense of the command structure — the cramped quarters, the dispatches arriving through the night, the maps spread on tables.
The museum contains Wellington's personal effects, his campaign furniture, portraits, letters, and artefacts from the battle. It is a more personal counterpart to the Memorial 1815 on the battlefield — less about the fighting and more about the man commanding the Allied forces. The town of Waterloo itself is about 5km north of the Lion's Mound, so plan your visit to include both.