Fences, ditches, telephone and electric wires seem to surround every acre. You aren't even safe when you do walk into a wilderness area where no human activities or objects scare the land. I can't tell you how many times I have set up to photograph a sunrise or sunset and while waiting for the best color, have a jet plane fly right through my picture leaving an ugly contrail behind. Even during the winter when fresh snow adorns the mountains, the activities of man can be a problem. Snowmobile tracks in the landscape have prevented me from taking many winter photos.
Signs seem to show up everywhere.
May. My biggest problem was keeping all the interpretive signs out of my photos. And if you think fogging your 35mm lenses is a problem on a dewy morning, just try shooting large format gear which has larger glass surfaces and a big viewing screen at the back of the camera. There are many different large format cameras available and nearly all will work well for photographing natural landscapes. Most photographers use what are called flat-bed field cameras because they are lightweight and compact. However, I have owned three different field cameras and don't prefer them.