Entire complex on Castle Rock

Photo from Wikimedia Commons
Edinburgh Castle
Scotland's fortress dominating the capital from an ancient volcanic plug/World Landmarks
Edinburgh Castle sits atop Castle Rock, a volcanic plug that has been a fortified site for at least 3,000 years, making it one of the oldest fortified places in Europe. The castle dominates the Edinburgh skyline from its 130 m high position above the city. The complex covers about 35,000 square meters and includes the 12th-century St Margaret's Chapel (Edinburgh's oldest surviving building), the Scottish Crown Jewels, and the Stone of Destiny. Over 2 million visitors make it the most visited paid attraction in Scotland.
Measurements
Above sea level
Sheer cliff on north side
Parade ground approach
Above the castle approach
Famous medieval siege cannon on display