Y Das, Tomen

Y Das is a proper Iron Age hill fort that sits on Tomen, commanding the landscape around Hereford like something from a history book come to life. What you're looking at is a raised earthwork - concentric banks and ditches that once formed a defensive settlement, probably somewhere between 500 and 100 BC. The ramparts are still clearly visible if you know what you're looking at, though nature's reclaimed most of it now. There's something satisfying about standing up there and realising people chose this exact spot for protection all those centuries ago.

It's a walker's attraction really, not a sit-down-and-read-plaques sort of place. The site itself is open access - no visitor centre, no gift shop, just you and the earthworks. You can be up and down in thirty to forty minutes, though it's worth lingering if the weather's decent. The walk up is reasonably straightforward, though it gets a bit steep depending which side you approach from. Families with older kids will manage fine; younger ones might find the lack of facilities a bit limiting.

If you're camped at Bryndu or Olchon Valley, you're only five miles away, making it an easy morning or afternoon sortie alongside exploring the wider Mid Wales countryside. Hay-on-Wye's barely further, so you could easily combine this with the town's bookshop culture. Best visited in clearer weather when the views across to the Black Mountains actually reward the climb.