The extent to which we are surrounded and affected by bacteria, fungus and molds is the subject of "Kinrui no Fushigi" currently running at the National Museum of Nature and Science in Tokyo's Ueno Park. Molds, bacteria and, mostly, mushrooms of every shape and form fill the museum, as do drawings by mangaka Masayuki Ishikawa, author of the series Moyashimon: Tales of Agriculture, from which the characters come.
Second only to insects, there are 80,000 different known forms of fungus, mold and bacteria--and a suspected 1.5 million that have yet to be discovered--so there is a lot of ground to cover in very little space.
However, some of the most interesting fungi on exhibit are at the beginning, where there are protolaxite fossils dating back 440 million years. These ancient fungi grew to as much as nine meters tall and 1.5 meters wide, a fact illustrated by two lifesized replicas.
Well worth a visit if you are passing!