I found this show to be very interesting. However, the host is quite repetitive, and I would have liked to see more EXPERT commentary. He often spouts off vague explanations and seems unsure if we are looking at a cemetery/hippodrome tunnel/ royal courtyard/ lavatory. you get the idea. I also have a penchant for dark spaces so I really feel at home watching this show. However I feel like they could have spoken more about the creatures that live down there, since they are obviously not abandoned. If you pause at 3:40 in the Instanbul video you will see traces of scat. I would have enjoyed it if the narrator had identified the scat and given more insight into what animals live down there (cats). Overall, the imagery makes the show interesting enough to keep me watching. would bump up rating to 8 with more cats.7.5/10

Rarely does a documentary show something you have never seen before. Almost every episode of "Cities of the Underworld" reveals underground wonders I was unaware existed. Season one was tremendous, covering cities of both the New and Old World. Each episode is set up with a brief history of the region, and the guides are interesting, and informative. As for the hosts, they are not abrasive as some others have claimed, perhaps a little over enthusiastic, but still totally acceptable. I like the way Eric Geller and Don Wildman ask to go beyond the obvious in their explorations. Without question this is the best documentary I have ever seen, and I hope there are many more seasons to come. - MERK

I love the show, and I normally don't comment but I feel the need to speak up. Eric Geller did an excellent job as the host. A major part of the reason I watched the show, was due to his enthusiasm. Yes, there was a certain amount of reiteration, but this is done for the slower members of the viewing audience. His zest and obvious interest is what he is doing, is so lacking from some shows out there. When the host is obviously bored by the topic, and isn't having fun, the viewers won't have fun. I read a rumor that the History channel has renewed for another season. I hope they bring Eric back, and allow him to continue to have fun with the show and share his joy in the topic.

This program has turned out to be a very interesting investigations of the 'secret' underground worlds under many of the largest and most famous cities of the globe, from New York to Budapest, London to Rome.The information is well presented and filmed and your interest is held comfortably for the length of the shows.My only complaint, and it occurs only occasionally, is that the presenter, Eric Geller, can become overly loud and overly demonstrative when pointing out certain areas or items that, in my opinion, didn't deserve the exaggeration, yet most of the time he is enthusiastic and not as overpowering.