bodyweight strength training

Hi guys

im travelling around the world soon for 12 months. This will often mean there won't be a gym nearby. Can anyone recommend a solid bodyweight circuit that hits all the muscle groups and suggest ways to progress. The goal is too keep in shape and gain muscle.

I understand that barbell training is the most effective way to gain muscle, ive done sl and 531 before with good results, but a gyms won't always be available and I want a routine I can do everyday, anywhere. Any helps appreciated. I did post on the bw thread with no avail.

Thanks