What events still occur within a transaction that gets rolled back?

Is it true that all data modifications are undone when the transaction they are a part of gets rolled back? For example if a cursor that just executed a stored procedure 100 times that updated a table on each iteration, would all those updates get rolled back? Would a DDL statement get rolled back?...such as DROP TABLE or CREATE VIEW? What about DROP DATABASE? I know certain statements still execute though like PRINT "MESSAGE". I'm just trying to get an idea of what kinds of events still occur.