Marek G. answered 06/26/19
Experienced Tutor Specialized in German and Web Technologies.
This usage is correct, because it is used as a general statement, without specifically mentioning who wants to overcome the barrieres (e.g., politicians, residents, people, etc.). If you want to be more specfic, you'd say: "Auch 25 Jahre nach dem Fall der Berliner Mauer gibt es noch viele Barrieren, die von den Bürgern überwunden werden wollen."