United Kingdom

It's largest, and has the most history. Lichfield doesn't have much apart from the cathedral (home town of Samuel Johnson, I think, so I'd guess there's something there about him if you're a fan); Peterborough is larger, but not a tourist spot.

https://www.nationalrail.co.uk/ (I assume it's accessible outside the UK) has a journey planner that gives you an idea of how long between stations, and what changes of train you might have to make.