From the Earth to the Moon: A Direct Route in 97 Hours, 20 Minutes — Jules Verne

Classic adventure story by Jules Verne. It tells the story of the president of a post-American Civil War gun club in Baltimore, his rival, a Philadelphia maker of armor, and a Frenchman, who build an enormous sky-facing Columbiad space gun and launch themselves in a projectile/spaceship from it to a Moon landing.

The story is also notable in that Verne attempted to do some rough calculations as to the requirements for the cannon and, considering the total lack of any data on the subject at the time, some of his figures are surprisingly close to reality. However, his scenario turned out to be impractical for safe manned space travel since a much longer muzzle would have been required to reach escape velocity while limiting acceleration to survivable limits for the passengers.