Edinburgh castle dominated much of the cityscape, and was very nice. A bit intimidating, really, but great to visit. It was built on the top of an old volcanic protrusion, and the gate is on the eastern side. The main road then wraps its way in a spiral-like fashion and goes through a series of four gates, and finally brings you to the top. The rock that it's built on is, in my opinion, cooler even than the castle, but the combination is incredible. Imagine trying to plan a sneak attack. Inside are several museums, and tours are done (I believe) hourly and free of charge. Admission, however, is a hefty £11. But it's well worth the money, and if you make sure to visit every possible corner like I did, you can spend hours inside and get the most from your money.
