You need a car. While some cities are accessible by train, the drop zones, fields, and foxholes are isolated. In Normandy, hire a local guide (like "Band of Brothers Tours") to get access to private fields.
While technically in the UK, this is where the men became a family. Aldbourne is a picturesque English village in Wiltshire. The village square is almost unchanged. You can stand outside the Blue Boar pub (now a private residence) where the men drank. Visit the Norman church of St. Michael’s, where many of the men attended services before D-Day. Most importantly, you can walk the lanes they marched down to the trucks that took them to the airfields. band of brothers sites