Antwerp Central Station!
In my trip to Belgium, I went to Anterwp,the city of diamonds. I went to see the Anterwp Central station. I would say is the biggest station I have ever visited. A 4 floor building that was hard to see it all.
Photo source:https://en.m.yelp.be/biz/centraal-station-antwerpen-antwerpen
Hehe, You found 1 of the 2 great marvels of Antwerp :-)