big arenas is rarely a boring 00:13:57,1000 --> 00:13:58,154 experience. 30 us dollars. you into a muay thaiouch with your inner monk? bit of elbow grease. along the way. we will be finding out why this italian village is so unlucky. and the cheapest way to see an iceberg. century alongside the banks of one of the city's rivers. that river, like many, was long ago paved over and forgotten. about the city's hidden rivers. we went to meet him. i have been living in london for about 39 years. these hidden rivers. to show them to other people, londoners, tourists. down to blackfriars. on hampstead heath, this is the beginning of the river fleet. and running through. it isn't hidden at this point, it's very exposed in streams and ponds. with the river fleet as well. and gore and blood into the river. foul and stinking, and so sadly they had to cover it up. when i was writing the book i had to get inside the sewers to see. we got donned up in overalls, hard hats, waders, a small oxygen supply. as i thought it was going to be. these sewers, they started building them in the 1860s. beautifully engin