There are a number of interesting places to visit with easy reach of Dalmonds Barns including:

Hatfield House
Wimpole Hall NT
Knebworth house
Audley End
St Albans
Shaws Corner
Waltham Abbey
Epping Forest
Paradise Wildlife Park

Blenheim Palace at Woodstock is just over a hour away, as are Whipsnade Zoo and Woborn Abbey Wild Life Park. It takes just under 2 hours to reach the Heritage Coast of Essex and Suffolk, and the ports of Harwich and Felixstow.