Royal Courts of Justice
Here is the vast Victorian Gothic pile of 35 million bricks containing the nation's principal law courts, with 1,000-odd rooms running off 3½ miles of corridors. This is where the most important civil law cases—that's everything from divorce to fraud, with libel in between—are heard. You can sit in the viewing gallery to watch any trial you like, for a live version of Court TV; the more dramatic criminal cases are heard at the Old Bailey. Other sights are the 238-foot-long Great Hall and the compact exhibition of judges' robes. Guided tours run Monday through Friday but must be booked online in advance; they include a chance to view original court documents relating to a certain Guy Fawkes.