Edinburgh is one of Europe's most beautiful capitals, its medieval Old Town and Georgian New Town creating a UNESCO World Heritage Site of exceptional architectural harmony. Edinburgh Castle dominates the city from its volcanic rock, while the Royal Mile descends to Holyrood Palace past ancient closes and historic buildings. World-class museums including the National Museum of Scotland offer free admission, while August brings the world's largest arts festival transforming the city. Arthur's Seat, an extinct volcano, provides spectacular views from the heart of the city.