The Lahti Radio Masts are among the city’s most well-known and prominent landmarks. Two 150-meter-high steel lattice masts rise majestically above the Radiomäki skyline, serving as a reminder of Lahti’s important role in the early years of Finnish radio broadcasting.

In the late 1920s, Finland’s national radio network needed a more powerful transmission station than what was possible from Helsinki. Lahti’s central location was chosen, and the country’s first high-power radio station was built on Radiomäki in the autumn of 1927. The towers were built quickly, and the station was inaugurated on April 22, 1928, beginning long-wave radio broadcasts that reached across the entire country.

The Radio Masts now serve as a historical landmark – although long-wave broadcasts ended in the 1990s, the towers remain a prominent part of Lahti’s cityscape and symbolize the development of communication technology in Finland. At the base of the Masts is the Mastola Radio and TV Museum, where visitors can explore the history of radio and television through exhibitions and equipment.