The Triangular Lodge is a folly (building constructed primarily for decoration), designed and constructed between 1593 and 1597 by Sir Thomas Tresham.
Tresham was a Roman Catholic and was imprisoned for a total of fifteen years in the late 16th century for refusing to become a Protestant. On his release in 1593, he designed the Lodge as a protestation of his faith. His belief in the Holy Trinity is represented everywhere in the Lodge by the number three: it has three walls 33 feet long, each with three triangular windows and surmounted by three gargoyles. The building has three floors, upon a basement, and a triangular chimney. Three Latin texts, each 33 letters long, run around the building on each facade.