If you're asking what it means, it means "where is the library?"
Donde esta la bibliotheca is a question so it would be:
¿Donde esta la bibliotheca?
This translates too:
Where is the library?
Donde= where
Esta= is
La= the
Bibliotheca= library
You would have to remove the ‘a’ between esta and la in your question and add the question marks as well.
Hope this helps! :3