I was in London, but not on an ABD. We did a few of the escorted walks http://www.walks.com/ . The best was the Jack the Ripper walk! They have a sister site that lists Paris walks.
Best part is, you just show up. We planned to do one walk, but something else came up, so we just did it another time.
edited to add: If the Jack the Ripper walk interests you, try for a night that Donald Rumbelow does the walk. He was fantastic and is THE authority on Jack the Ripper.
Best part is, you just show up. We planned to do one walk, but something else came up, so we just did it another time.
edited to add: If the Jack the Ripper walk interests you, try for a night that Donald Rumbelow does the walk. He was fantastic and is THE authority on Jack the Ripper.