and of great interest to scholars. There are a number of outstanding pieces of furniture including work by celebrated 18th-century cabinet makers, Ince and Mayhew, in addition to silver, tapestry and collections of other porcelain, much of this is on public display in the state rooms, or display cases for the ceramics. A new "Treasury" space in the Brewhouse displays annually changing exhibitions highlighting aspects of the collections. Parkland The avenues in the park were all laid out according to the 1755-1779 designs by Capability Brown, paying due respect to pre-existing plantings, some of which were from the 16th century or earlier. Brown also created the park's man-made lake in 1775–80. He discovered a seam of waterproof "blue" clay in the grounds, and was able to enlarge the original nine-acre (36,000 m2) pond to the existing 26-acre (105,000 m2) lake. Its design gives the impression of a meandering river. Brown designed the Lion Bridge at a cost of 1,000 guineas (£1,050) in 1778. He was paid £23,000 in total of the park designs in Burghley. Brown's landscape has been conserved by planting 30,000 new trees between 2012 and 2016. Originally, Coade-stone lions were used as ornamentation. After these weathered, the existing stone examples were made by local mason Herbert Gilbert in 1844. Queen Victoria and her husband Prince Albert planted two trees to commemorate their visit. As well as the annual Burghley Horse Trials, the park plays host to the "Burghley Run" for Stamford School and an annual meet for the Cambridge University Draghounds. Recent developments have included starting a sculpture garden around the old ice house and, in 2007, a "garden of surprises" was created using traditional ideas of water traps, shell grottos and a mirror maze, but in a 21st-century style. The Burghley House trust has commissioned contemporary artwork in the grounds from leading artists. The parkland and gardens of Burghley House are listed Grade II* on the Register of Historic Parks and Gardens. Today The Lincolnshire county boundary crosses the park between the town of Stamford and the house. Burghley is located in the ancient Soke of Peterborough, once a part of Northamptonshire but now for ceremonial purposes in Cambridgeshire; for planning and other municipal functions the house is in the Peterborough unitary authority. The house is a Grade I listed building, with separately Grade I listed north courtyard and gate. The listing document for the House