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Saturn. Any time it's visible. Even through a small scope, when you see the rings, you are awe-struck.
Jupiter. The only objects brighter from Earth are Venus, the moon and the sun. Even in binoculars you can make out Jupiter's four Galileon moons. With fair optics you can see Jupiter's bands.
The Hercules globular cluster (M13):
Visible through binoculars, but better through even a modest telescope. If you have a 10" Dobsonian, its splendor is incredible. Like a plate of sparkly diamonds through all apertures. Splendid.
The Milky Way. When it's high in the sky, point your eyes, magnified or not, into that bright band. If your eyes are dark adapted, you will see wonders you cannot have imagined. In the Northern Hemisphere, the constellation Cygnus is right in the middle.
Near Cygnus, the Kepler space telescope views thousands of stars continuously looking for planets. It's found nearly 5,000. That means that there are a hundred of billions of planets in our galaxy, likely many more. Consider how many may also have life.
In late Autumn, and through much of the winter you can see, at a dark sky site, M31, the Andromeda Galaxy (M31):
The furthest away object in the universe easily seen without optical aide. It's six times longer than our moon's diameter, but it's dim so you'll need dark sky. I've seen it in California and Michigan without any scope. It's a challenge, but worth it. The light left Andromeda 2.5 million years ago!
Don't get me started about meteors, satellites, or the ISS transiting.
You can lose your soul for hours looking at a quarter moon through a scope. That's just the first step.
