In large parts, Newcastle still retains a medieval street layout. Narrow alleys or 'chares', most of which can only be traversed by foot, still exist in abundance, particularly around the riverside. Stairs from the riverside to higher parts of the city centre and the extant Castle Keep, originally recorded in the 14th century, remain intact in places. Close, Sandhill and Quayside contain modern buildings as well as structures dating from the 15th–18th centuries, including Bessie Surtees House, the Cooperage and Lloyds Quayside Bars, Derwentwater House and "House of Tides", a restaurant situated at a Grade I-listed 16th century merchant's house at 28–30 Close.