Hailes Abbey is a Cistercian ruin in the countryside north-east of Cheltenham, once an important pilgrimage site because of a relic believed to be the Holy Blood. The monastery was dissolved under Henry VIII, leaving arches, foundations, and enough stonework to suggest the scale of the place.
The abbey works best as a Cotswold excursion rather than an urban Cheltenham sight. Pair it with Winchcombe, walking routes, or nearby churches, and let the quiet setting do some of the work; the ruins are more evocative when you give them time.