1898. Mirko won the title "Champion of Globetrotter" crossed the path of St. Petersburg to Paris in just 110 days. With his brother Stephen went in 1899. the way around the world. In the service of Emperor Menelik II. was governor of the southern provinces of Ethiopia. The brothers have carried out geomorphological, climatological and ethnographic field research Rudolf and Stefanijina lake (there are established Seljanville). Godine 1903. go to South America, exploring waterfalls Sete Quedas and unexplored river Aquapei. In 1911. explore saltpeter deposits in Chile. They began work on a project to connect the Atlantic and Pacific, the Amazon, but that plan fell through after Mirko died during an expedition in the Amazon. The brothers have released sketches of different travelogue in many languages​​, and collections of material culture in Ethiopia and South America gave to the Ethnographic Museum in Zagreb.