No, even 4 dimensional figures exist. they are visible, but are found very rarely.
If you wish, you can create them. Actually the 4 dimensional figures can be drawn 2 dimensionally. Real 4 dimensional figures appear 3 dimensional at certain angles. This is because their fourth dimension lies at the back side.
For instance, the Indian national emblem, in the front view, we can see only 3 lions until we change the angle in order to see the 4th lion.
This is just an example. It doesn't mean that our national emblem is 4 dimensional, it's 3 dimensional. You can see 4 dimensional figures in google images.
NOTE: If you aren't Indian, it's possible that you've never seen our national emblem. Just try to search for it in net.