In 2009, archaeologists dug up the car park to find out more about the buildings. They found paths from gardens that had been on the site before the building was put up. They also found the remains of an octagonal (eight-sided) kiosk which had sold food snacks and drinks in the gardens. They also found the remains of an extra building put up in 1888 to hold military weapons that were part of the 1880 exhibition.