National Trust site Cliveden in Buckinghamshire is just a 50-minute drive from Watford via the M40 or the A412. You can find out more about Cliveden via the National Trust website. The National Trust gem less than an hour from WatfordThe National Trust shares that Cliveden is "set high above the River Thames" with "magnificent gardens and breath-taking views" that have been admired for centuries. National Trust shares that the real gem of the estate is Cliveden House, which is currently leased as a luxury country hotel and is generally not open to visitors. However, until October, on a Monday, Tuesday and Thursday, National Trust visitors can enjoy a 30-minute guided visit.