Made a World Heritage site in 1987, Fountains Abbey and Studley Royal is the National Trust's most visited pay to enter property.
Fountains Abbey was founded in 1132. It became one of the most wealthy religious houses in England due to the introduction of the Cystercian system of lay brothers, leading to mining, quarrying and horse breading. Unfortunately this all ended during the reign of Henry VIII due to the dissolution of English Monasteries.
There are some fine examples of church architecture on this site, naturally there is the abbey itself, but also there is an anglican church called St. Mary's, which is a fine example of gothic architecture, designed by architect William Burges. There are also temples, towers and various other buildings located within the grounds that are worth taking a look at.
Opening times vary throughout the year, so its best to check before you go. The deer park is open during daylight hours and access to the whole grounds is available all year round (except Christmas Eve and Christmas Day).