Hi Frederick fans!

I am delighted that this fandom exists, and sometimes lurk on the fringes.

I also have a friend who is planning a trip to Germany in late March / early April. She and her husband will be in Trier, Frankfurt, Cologne, Bonn, and Luxembourg.

Are there Frederickan sites, museums, or other points of interest they should visit?

Thanks in advance for any suggestions! They are much appreciated.