The oldest looking building on the Grand-Place is not actually the oldest one; it just looks that way. The “King’s House” used to be a special residence for government officials; now it’s the museum of the City of Brussels.
Of course it’s worth a look.
There’s the usual stuff about how the original settlement was at the farthest navigable spot on the Senne River, how the town grew to a city, it’s importance in trade, etc. And how the river turned into little more than an open sewer (that flooded on occasion), so it was decided that the best thing to do would be to cover it over.

