Painted Monasteries of Bucovina and Moldova

Monasteries from Bucovina and Moldova are part of UNESCO; there are unique in the world by their architecture that characterizes the glory epoch of Moldova and by their exterior painting.
Their frescoes hidden mysteries that even today, after more than 500 years, have not been deciphered; a mystery, that all painters and modern chemists would like to find and learn, it is unaltered colors, nor by centuries past ~ nor by harsh weather conditions.