We land in Dusseldorf at 7 a.m. and depart London at 7 a.m. nine days later.

We are pretty much open to going anywhere by train or bus. We have eight full days to fill. My better half loves castles/palaces and historic things. I think we will want to spend at least three full days in London.

Any suggestions on what cities or areas to visit leading up to going to London? Right now I'm leaning toward visiting the cathedral in Cologne and then taking a train that same day to Luxembourg. Sped some time there before heading to Belgium but wondering if Amsterdam is worth a visit.