Macedonian authorities. Economy The town's metal-processing, tobacco, agriculture, footwear and textile industries have made it an economic, trading and cultural center of approximately 135,529 people. Agriculture and trade developed mainly in the 19th century, but the city's modern look was established after the Second World War. In 2013, the Macedonian Government published a list of companies with the highest revenue. Four companies from Kumanovo are on this list. In 72nd place is KVALITET-PROM DOOEL with 24,643,312 euros, 130th place is DETOIL DOO with 14,912,153 euros, 142nd place is EKSTRA MEIN DOOEL with 13,231,496 euros, and 151st place is 11 OKTOMVRI AD with 12,878,225 euros revenue. The most profitable company in that same year was PROSTOR DOO with 1,458,759.85 euros profit before taxes. Infrastructure Railway A railway connection exists between Skopje with Serbia via Kumanovo. In 2013, rehabilitation of the railway section between Kumanovo and the village of Beljakovce will commence, which is part of the Railway Corridor VIII that will connect North Macedonia with Sofia, Bulgaria and the Black Sea to the East and Tirana, Albania and the Adriatic Sea to the West. Roads A 40 kilometre () highway exists between Skopje and Kumanovo, going near Kumanovo in the north and crossing the border with Serbia. On the section Kumanovo-Miladinovci there is a Pay tool. Section of the Pan-European Corridor X was put into use in 2010 connecting Kumanovo to the border crossing Tabanovce. The highway was built for 4 years and at a cost of 15.5 million Euros. Another important road goes from Kumanovo to Kriva Palanka and then to the border with Bulgaria. Air Travel Skopje International Airport is south of Kumanovo. The E-75 motorway is accessible from Kumanovo. Sofia Airport is from the city and Thessaloniki International Airport is . Near Kumanovo is Adzi Tepe Airport which is without a paved runway. Culture Monuments and Landmarks Kumanovo has several prehistoric monuments dating back to the prehistoric period, including: , an archaeological site from the Bronze Age near the village of Pelince Near the village of Mlado Nagoričane is another interesting site dating from the period of Neolith. Near the village of Lopate is the Drezga place that represents a Roman necropolis. One of the most important sites located near the Kumanovo is the 4,000-year-old megalithic astronomical observatory of Kokino, located northeast of Kumanovo and discovered in 2001. It is ranked fourth on the list of old observatories