I was surprised to find out, from the Chicago Tribune’s funny pages no less, that the world’s smallest volcano is only about 43 feet high. It is located in Puebla City, Mexico, and is called Cuexcomate.
You can read about it here.
The picture above shows a metal staircase descending into the (inactive) volcano.
For a good April Fool’s Joke, read about a volcano that is only 2 cm tall and grows on the side of a log.