Castell Cidwm

Stone foundations scattered across a hilltop field are all that remain of this medieval Welsh stronghold, but the views across the Menai Strait towards Anglesey make the scramble worthwhile. You'll find Castell Cidwm perched on elevated ground just outside Caernarfon, its earthwork defences still clearly visible despite centuries of erosion.

History enthusiasts will appreciate the site's strategic importance - this was clearly chosen as a defensive position to monitor traffic through the strait. The remains aren't spectacular by any means, but there's something rather moving about standing where medieval soldiers once kept watch. Kids might find it all a bit underwhelming unless they've got active imaginations.

Getting there requires a decent walk across farmland, so wear proper boots and check the weather. The site appears to be freely accessible, though there's no formal visitor infrastructure or signage to speak of. Allow about an hour including the walk, longer if you're keen on the views.

For families staying at nearby parks like Bryn Gloch or Talymignedd, it makes for a reasonable morning expedition before heading to more obvious attractions. Combine it with a trip into Caernarfon itself - the town's magnificent castle will provide a stark contrast to these humble ruins and give the children something more substantial to explore.