Jules Verne's Rocket to the Moon

The name of this movie is Jules Verne's Rocket to the Moon released in 1967-07-13 and it's main theme is Phineas T. Barnum and friends finance the first flight to the moon but find the task a little above them. They attempt to blast their rocket into orbit from a massive gun barrel built into the side of a Welsh mountain, but money troubles, spies and saboteurs ensure that the plan is doomed before it starts....