We both had a great time exploring the Museum of London! This is a piece of the Fatberg that clogged part of the sewers here a few years ago, and had to be cut up with high pressure water and hand tools. Behind the sample is a photo of one of the lucky workers who had to crawl tiny tunnels and chip the concrete-like fat deposits off the walls and floors by hand. The London Museum describes its responsibility as “preserving the history of the city, at its best and at its worst”.