The Forest Runners by Joseph A. Altsheler

Paul stopped in a little open space, and looked around all the circle of the forest. Everywhere it was the same—just the curving wall of red and brown, and beyond, the blue sky, flecked with tiny clouds of white. The wilderness was full of beauty, charged with the glory of peace and silence, and there was naught to indicate that man had ever come. The leaves rippled a little in the gentle west wind, and the crisping grass bowed before it; but Paul saw no living being, save himself, in the vast, empty world.