This picture is of a climax rainforest on Vancouver Island off the west coast of Canada. The dominant trees are Western Red Cedar and Douglas Fir but there are others. The tree tops are upwards of 100 metres and the fact you don't see them in this picture gives a truer sense of being there -- you really don't see the tops of most of the trees.
This picture was made with a wide-angle lens, so it's a little difficult to make out the sizes of its objects. To help, the log entering the centre of the picture from the lower left is about 6 feet. The camera is about 9 feet off the forest floor.