Caspar David Friedrich, 1818. Lone figure on a mountaintop facing a sea of mist. Kunsthalle Hamburg.
From Wikipedia
Wanderer above the Sea of Fog is a painting by German Romanticist artist Caspar David Friedrich in 1818. It depicts a man standing upon a rocky precipice with his back to the viewer; he is gazing out on a landscape covered in a thick sea of fog through which other ridges, trees, and mountains pierce, which stretches out into the distance indefinitely.