This courthouse replaced the infamous Newgate Prison, once the scene of hangings and other forms of "public entertainment." It's affectionately known as the "Old Bailey" after a street that runs nearby. It's fascinating to watch the bewigged barristers presenting their cases to the high-court judges. Entry is strictly on a first-arrival basis, and guests line up outside; security will then direct you to one of the rooms where cases are being tried. It's impossible to predict how long a line you might face. If there's a London equivalent of the O.J. Simpson trial, forget about it -- you'll never get in. On a day with trials attracting little attention, you can often enter after only 15 minutes or so. You never know until you show up. The best time to line up is 10am. You enter courts 1 to 4, 17, and 18 from Newgate Street, and the others from Old Bailey Street.