What are some good muscle building / bodybuilding exercises without equipment?

I'll be going overseas in a few days for 1 month.
I have been bulking up for 3months now and I don't want this month to stop my progress or have too much of a hindering effect on my goals.
I won't have access to a gym or weights, it will just be me and my body. Can you guys name some good exercises that will use my own bodyweight and promote muscle growth.
The ones I can think of is:
-Pushups
-Crunches (with a book or something heavy behind my

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