From Barcelona, you may take a taxi to Montserrat. However, there is no taxi queue after you get in Montserrat. You must contact the private transfer company and make a request to be picked up  and take you back to Barcelona . And while in Montserrat, please don't forget to enjoy the panoramic views of Catalunya. Because Montserrat is outside of the city and based in the countryside it also offers you a quiet and serene environment.