A group of high school students (XII Liceum) in the framework of the Roland Maze Project has built a compact telescope of three Geiger-Muller counters. The connection between the telescope and a PC computer was also created and programmed by students involved in the Project. This has allowed students to use their equipment to perform serious scientific measurements concerning the single cosmic ray muon flux at ground level and below. These measurements were then analysed with the programs on the basis of current knowledge on statistics. An overview of the apparatus, methods and results have been presented at several student conferences and recently won the first prize in a national competition for high school students' scientific work. The telescope itself, in spite of its "scientific" purposes, is built in such a way that it can be hung on a wall in a school physics lab and count muons continuously. This can help to raise in interest in studying physics among others. At present a few (three) groups of young participants of the Roland Maze Project have already built their own telescopes for their schools and some others are working on it. This work is a perfect example of what can be done by young people when respective opportunities are created by more experienced researchers and a little help and advice is given.