The New Town is a central area of Edinburgh, the capital of Scotland. It was built in stages between 1767 and around 1850, and retains much of its original neo-classical and Georgian period architecture. Its best known street is Princes Street, facing Edinburgh Castle and the Old Town across the geological depression of the former Nor Loch. Together with the West End, the New Town was designated a UNESCO World Heritage Site alongside the Old Town in 1995. The area is also famed for the New Town Gardens, a heritage designation since March 2001. Proposal and planning The idea of a New Town was first suggested in the late 17th century when the Duke of Albany and York (later King James VII and II), when resident Royal Commissioner at Holyrood Palace, encouraged the idea of having an extended regality to the north of the city and a North Bridge. He gave the city a grant:That, when they should have occasion to enlarge their city by purchasing ground without the town, or to build bridges or arches for the accomplishing of the same, not only were the proprietors of such lands obliged to part with the same on reasonable terms, but when in possession thereof, they are to be erected into a regality in favour of the citizens.It is possible that, with such patronage, the New Town may have been built many years earlier than it was but, in 1682, the Duke left the city and became King in 1685, only to lose the throne in 1688. The decision to construct a New Town was taken by the city fathers, after overcrowding inside the walls of the Old Town reached breaking point and to prevent an exodus of wealthy citizens from the city to London. The Age of Enlightenment had arrived in Edinburgh, and the outdated city fabric did not suit the professional and merchant classes who lived there. Lord Provost George Drummond succeeded in extending the boundary of the Royal Burgh to encompass the fields to the north of the Nor Loch, the heavily polluted body of water which occupied the valley immediately north of the city. A scheme to drain the Loch was put into action, although the process was not fully completed until 1817. Crossing points were built to access the new land; the North Bridge in 1772, and the Earthen Mound, which began as a tip for