Wales has more castles per square mile than any country in Europe. This 7-day route visits 10 of the best, with van-friendly parking at each stop.
Day 1-2: North Wales Castles
Conwy Castle (UNESCO). Park at Conwy Quay car park (LL32 8AY, £6/day, height 2.4m). Overnight at Conwy Marina (pay, £10). Caernarfon Castle (UNESCO). Park at Slate Quay (LL55 2PB, £5/day). Overnight at Dinas Dinlle (free, cliff top).
Day 3-4: Mid Wales
Harlech Castle (UNESCO). Park at Harlech car park (LL46 2UG, £4/day). Stunning views over the Llyn Peninsula. Overnight at Shell Island (pay, £12). Dolwyddelan Castle. Small car park (free). Off the A470. Less crowded.
Day 5-7: South Wales
Cardiff Castle. City parking available (NCP, £12/day). Caerphilly Castle. Largest castle in Wales. Park at Caerphilly town centre (£4/day).
Best Value
Historic Wales membership (£44/year) gives free entry to all 6 Welsh government-operated castles. Worth it if visiting 3+ castles.
Conclusion
A brilliant week-long tour. Start in Conwy, work south along the coast, finish in Cardiff. Each castle is 1-2 hours of exploration.

