The designer of this the largest of the garden buildings is unknown, both Earl Temple and Thomas Pitt, 1st Baron Camelford have been suggested as the architect. Built from stone, between 1747 and 1749, the building is located where the two legs of the valley meet. It is raised on a podium with a flight of steps up to the main entrance, the cella and pronaos is surrounded by a peristyle of 28 fluted Roman Ionic columns, ten on the flanks and six at each end. The main pediment contains a sculpture by Peter Scheemakers of "Four-Quarters of the World bringing their Various Products to Britannia", there are six statues acroterion of cast lead painted to resemble stone on both the east and west pediments. In the frieze of the entablature are the words "CONCORDIAE ET VICTORIAE", the sculpture on the building dates from the 1760s when it was converted into a monument to the British victory in the Seven Years' War. The ceiling of the peristyle is based on an engraving by Robert Wood of a ceiling in Palmyra. Within the pronaos and cella are 16 terracotta medallions commemorating British Victories in the Seven Years' War, these were designed by James "Athenian" Stuart, each one is inscribed with the name of the battle: Quebec; Martinico &amp; c.; Louisbourg; Guadeloupe &amp; c.; Montreal; Pondicherry &amp; c.; the naval battle of Belleisle; the naval battle of Lagos; Crevelt &amp; Minden; Fellinghausen; Goree and Senegal; Crown Point, Niagara and Quesne; Havannah and Manila; Beau Sejour, Cherburgh and Belleisle. The wooden doors are painted a Prussian blue with gilded highlights on the moldings. Above the door is an inscription by Valerius Maximus: