Brussels , what to see?

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We arrived to brussels nice cosmopolitan city where the base of the EU is modern, nice transport but still don't know the touristic spots, nice cathedral, modern business zone, some very nice gardens. I'm positive that I must be unfair with this city we were very tired and not so willing to made more research on what we can see on it.

But why do we that stop, to take the brand new Eurotunnel and go to the UK (almost broken).

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