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First things first. This is a story about three girls who 1) go into a fort, 2) come to a tunnel, and 3) run through the tunnel.
So you need an establishing shot — the fort in the background, with the girls approaching. The green screen will work for this.
The interior of the fort — the passages they traverse to reach the tunnel — can be anywhere that suggests “fort-like” hallways. With a combination of actual hallways and closeup cutaways of the girls, you can make this sequence as complex as you like. The shot selection here is on the girls, not on the hallways. A few carefully selected props and set dressing will sell the idea that you’re inside the fort.
Any tunnel-like site you can find will work for the tunnel. Halloween is coming up soon and you can probably find a haunted house with tunnel-like elements that you can use. Or create a tunnel in a long hallway. Black plastic garbage bags, painted, bunched and taped to the walls will give you a great approximation of rough stonework under low light.