So our neighbor's cat has been visiting us for a while, so I decided to build this ramp so that she could more easily get into and out of our yard. I'm not much of a woodworker, but was happy with how this turned out.
It's made almost entirely from cedar fence posts. Nearly 18 feet long (3 fence posts end to end with the dog ear tip cut off). Ripped cedar planks into 3 for a frame/support to prevent flexing. Posts are pine 2x4, and go 18 inches into the ground, which was the majority of the effort, since our ground is like cement...
Well my fiance likes the cat even more than me, so she loves the ramp. The stone wall just outlines a yard. I didn't do the original landscape, but the backyard was sloped, so the previous owner flattened out a lot of it and then surrounded that part with the brick wall stone/things. You can see the max height of the wall, and that goes along the back fence (the side fence is pictured). I actually turned the back raised area into a garden several years ago, which was also a ton of work, because as I mentioned, the ground is like concrete, and I had to dig it all out and replace with nice soil.