Prepositions can be used to show movement.
to, through, across
We use to to show movement with the aim of a specific destination
I moved to Germany in 1998.
He's gone to the shops.
We use through to show movement from one side of an enclosed space to the other.
The train went through the tunnel.
We use across to show movement from one side of a surface or line to another.
She swam across the river.
More prepositions of movement