A genuinely wild-feeling wood, sometimes called 'the New Forest in Wiltshire' — one of the better bird and fungi spots on this list, and worth a proper unhurried walk rather than a quick stop.
A large tract of ancient oak woodland marking the northern boundary of the New Forest, part of the New Forest Special Area of Conservation despite sitting in Wiltshire. Pedunculate and sessile oak, alder and lime support woodland birds including cuckoo, hawfinch, nightjar, redstart and wood warbler, alongside dormice, bats and nearly 600 recorded species of fungi. A path bounded by medieval banks, built to guide commoners' cattle and pigs between copses and commons, runs through the wood.
National Nature Reserve — one of the country's finest wildlife sites. Open, but stick to marked trails.