Private guided tour of Antwerp

I'm writing you from Authentic Entertainment, where we're currently in production on our 3rd season of CITIES OF THE UNDERWORLD, a 13-part series for the History Channel.The show follows our adventurous host, Don Wildman, as he uncovers archaeological and cultural history lying beneath the streets of cities around the world. From Cold War-era bunkers hidden beneath a house in Berlin, to a Byzantine Hippodrome buried below an Istanbul high school, Don travels the globe to uncover escape routes, crypts, dungeons, even entire palaces buried beneath the streets. We have been to places like Paris, Rome, Tokyo, and Jerusalem, and we're very excited to be planning two episodes in Belgium & the Benelux region, one focused on WWI locations and the other on the Dark/Medieval Ages, set to shoot between July 13th-August. We have our WWI locations locked down, but we are still looking for interesting Medieval/Dark Ages locations with compelling underground elements to them. So far, our researchers have come up with the following potential sites: The subterranean city of Naours (France), St. Pietersberg Quarries (Maastricht), Citadel of Dinant, Bouillon Castle, Bock Casemates, Bourscheid Castle, Antwerp's Ruien (medieval sewers).
I am writing you wondering if you might be familiar with the history and architectural makeup of any of these sites, and/or if you might have suggestions for sites not on our list. Our biggest challenge, it seems, is avoiding the tendency towards historical recreations, in mannequin displays, etc, as our show strives to look at historical sites in their purest forms, and to travel off the beaten path to unknown or otherwise off-limits sites whenever possible. The History Channel is available in 230 million homes in 120 countries around the world. Its target demographic is adults 25-54, and these shows will repeat frequently. Millions of viewers will see an informative and lively depiction of your city's vibrant present and past, and tour guides associated with the program will receive amazing exposure. Thank you very much for your time, and for any help you might be able to provide. I look forward to hearing from you.