There is a reason why you can't see past horizons.
The sun rises in the east and sets in the west.
If the sunrise is the future. A hopeful new day, a new adventure.
And sunsets represent the past. Another day gone by, done in a blink of an eye.
And where you stand is the present.
You can't see past the horizon because you can never be in the past or the future no matter where it is you look.
You can walk in any direction but there will always be another horizon even when you turn around.
So you keep walking, watching the scenery change and the world grow.