Trembling Rock

France's Huelgoat forest is filled with massive boulders and impressive geological sights, but easily the most interactive of them is the oblong boulder known as Trembling Rock, which anyone can go up to and push around. 

The lush, dense forest near the commune of Huelgoat in France was once a part of royal lands, reserved for the wealthy to experience. but now it is open to anyone looking to experience 2,500 acres of wilderness. The River d'Argent runs throughout the forest and many of the boulders, which seem to congregate along the edges likely ended up in their current spots thanks to some ancient version of the rushing waters.

Trembling Rock is simply one such boulder, left perched atop a much wider rock base in a unique position. Due to the tiny peak or ridge it sits on, the 137-ton stone can actually teeter a bit if you know where to push. Getting up under one end of it and gently rocking the stone will cause it to move a little, making anyone who does it look like the strongest person in the world.

Rock formations are always a welcome sightseeing spot, but not many of them actually give you something to do. Be sure to bring someone to impress.