Zodiacal light

Zodiacal light, featured near the center of this remarkable panorama, is produced as sunlight is scattered by dust in the Solar System's ecliptic plane... In the picture, the narrow triangle of Zodiacal light extends above the western horizon and seems to end at the lovely Pleiades star cluster. Arcing above the Pleiades are stars and nebulae along the plane of our Milky Way Galaxy.

I've never seen this, but perhaps there's too much light pollution where I've been (plus I didn't even know it existed to look for it).  You learn something every day.