My recent post about Salzburg got me thinking about fabulous fortresses. While we have many forts in the United States, we are severely lacking in castles. Large, looming castles, that look out over medieval cities. Which we also lack. Alas, some things will always require travel, but are well worth the trip. For something straight out of Harry Potter, head straight to J.K. Rowling’s hometown, and Edinburgh Castle. Perched high above the Gothic spires of Edinburgh, atop the aptly named volcanic plug Castle Rock, sits Edinburgh Castle. Although the site has been occupied since the Bronze Age, the current configuration is much more recent. Dating to the 12th century, it…