Caer Rufeinig Segontium

The Roman fort at Caer Rufeinig Segontium sits on the outskirts of Caernarfon, a proper slice of military history that's been quietly holding its ground for nearly two thousand years. What you're actually looking at is earthworks and partial stonework from a fortress that once housed around five hundred Roman soldiers - think defensive ditches, rampart lines, and the faint outline of barrack blocks if you know what you're looking for. It's not a reconstructed theme park experience; this is archaeology in its honest state, which some will find brilliant and others might find a bit underwhelming depending on what you're after.

Walkers and Roman history enthusiasts will get the most from a visit here. You can spend thirty minutes to an hour poking about the site, which sits on accessible ground near the town. The Caernarfon area is well-geared for a longer stay, with Coed Helen Holiday Park just under a mile away and several other parks within striking distance like Anglesey Holiday Pods and Morfa Lodge, making it a sensible add-on to a broader Anglesey or North Wales trip.

Families with young children might find it a bit static unless they're already into Roman Britain - there's no visitor centre or interpretation boards to speak of, so you'll need to do your own homework beforehand or bring a guide. The real value here is as a walking stop rather than a destination in itself. Worth half an hour if you're in Caernarfon anyway, but don't plan a day around it.