The city of Edinburgh was built on the southern shore of the Firth of Forth Estuary, and is home to just under half a million people. Scotland's capital has a proud history, with the prominent second century castle overlooking the city atop its volcanic rock perch. Rent a car from Edinburgh's Picardy Place and explore the city's old and new towns, which are collectively listed as a UNESCO World Heritage Site, divided by the Princess Street Gardens. The city's original district is home to a stunning skyline which includes Greyfriars Kirkyard, Holyrood Palace and the Church of St Giles. The new town plays host to the city's arts and cultural offerings, and was subtly developed alongside the original.