We have a pond that was installed about 15 years ago, and besides the fish in it, it attracts ducks & geese, redwing blackbirds, and swallows that swoop over it to catch insects.
We've erected 3 bat houses.
I've planted serviceberries, American high bush cranberries, Washington hawthorns, ROD, and small-fruited " bird " crabapples that feed a multitude of wild birds.
I've collected and planted blackberry fruits from another location. We have wild blueberry around the property.
We've let several stands of milkweed grow and avoided mowing it down to attract Monarch butterflies.
Birds must have " dropped " some elderberry on our place - we have several patches of it and we didn't plant it.
We've logged 3 areas of the property in the last 20 years and mostly left it come up in whatever nature wanted. This includes stump sprouts, naturally seeded saplings, and we planted spruce, hemlock, pines, and balsam fir to supplement nature in those cut areas. Many weeds and forbs hatched as well.
We have many natural wildflowers, and we plant buckwheat each year. Though the buckwheat is food for deer, it attracts loads of pollinators of all sorts.