There are times when guided tours veer into "too much information" territory. A historic toilet tour, for example. A culinary survey of a market's weird meats. A stroll through a city's award-winning sewers. Then there are outings that are just plain peculiar: some follow in the footsteps of murderers and outlaws, while others visit sites that are creepy, malodorous or radioactive. Taking these tours just once would be more than enough for some of us — so spare a thought for the poor tour guides. Click through for a countdown of the oddest tours in the world.