An Aussie friend has been slowly making his way from Lisbon towards Germany for several weeks. I aim to join him for a few days from 03 June, probably using trains to Strasbourg and trains from Frankfurt. I may take my S&S bike but more likely a Birdy Blue. Either can fit into a Eurostar-compliant bag and changing at Lille seems the sensible option.
Philip isn't looking for huge distances (50 to 80ish km daily) or hunting cols. I enjoy checking out history, trains, bridges, what have you. I expect to be staying at cheap hotels or suchlike, rather than camping.
What are some things to look for/ visit along the way?