Barnet Physic Well open to the public. Free entry. The physic well is on the corner of Well Approach and Pepys Crescent. Please be aware that the Physic Well is in a relatively small room underground and is reached by steep stone steps. Barnet’s Physic Well is a mineral water spring which was thought to have therapeutic qualities. It was popular from the later seventeenth century through the eighteenth century, and its visitors included Samuel Pepys, who wrote about the visit in his diary.