The University of Stirling is a campus university founded by Royal charter in 1967, on the Airthrey Estate in Stirling, Scotland. The main campus is situated around 2 miles (3 km) from the centre of Stirling, but is much closer to the town of Bridge of Allan. It was formerly the estate of the Robert Adam-designed Airthrey Castle, which the University has retained and incorporated into the campus as teaching facilities and offices. It is regularly described as one of the most beautiful campuses in the world, and nestles at the foot of Abbey Craig and the Ochil Hills in 300 acres (1.2 km²) of grounds centred around the 18th century man-made Airthrey Loch. In 2002, the University of Stirling and the landscape of the Airthrey Estate was designated by the International Council on Monuments and Sites as one of the top 20 heritage sites of the 20th century within the UK. Stirling University is a Plate Glass University, established as a result of the Robbins Report on Higher education, along with Heriot-Watt University, the University of Dundee and the University of Strathclyde. This increased the number of universities in Scotland from four to eight.