The Veil nebula is a huge, ancient supernova remnant located in south-eastern Cygnus, near the border with Vulpecular. The most convenient stars to use as a guide in locating it are either the 2nd magnitude epsilon cygni, which lies 3 degrees to the north, or the 3rd magnitude zeta cygni, which lies about 5 degrees to the east. The size of the veil is what catches many inexperienced observers. It is over 2 degrees across. Although some sections are very faint, much of it is not difficult providing the skies are dark. I have found it readily visible with 80mm binoculars under magnitude 7.0 skies.
The above image shows NGC 6974, part of the central region, which is one of the segments that is more elusive to observe visually.