"Go to" is a phrasal verb, consisting of: 1. An action word - go 2. A direction word -to You generally need both to make any sense out of movement. "To" is a preposition. Look up your grammar book!

"to" just means destination, it can be used with many different verbs to describe how it moved. "I swam to the other side of the pool" "I handed the book to her" "I usually bike to work" "Go to" is the act of moving. "I usually go to work on my bike" (really you'd use the example a few lines above) "He should go to the hospital" "The award went to Joe" (Went is past tense of go)