There are many castles to visit within an easy drive of Townend Barn. They are from various periods and provide a fascinating insight into English history. Below are some links to help you plan your trail. 

http://www.english-heritage.org.uk

Lydford Castle and Saxon Town 

Okehampton Castle 

Totnes Castle

Berry Pomeroy Castle 

Dartmouth Castle 

Restormel Castle 

St Mawes Castle 

Tintagel Castle

Launceston Castle 

http://www.nationaltrust.org.uk 

Powderham Castle 

Castle Drogo  

Compton Castle  

Two Castles Trail
There is a 24 mile walk between two of the castles Okehampton and Launceston, details of which can be found at www.devon.gov.uk (search for Two Castles Trail).