Slovakia

Every year, a marathon street race - the International Peace Marathon - takes place on the streets of Košice (the second largest city in Slovakia).

An excerpt from the article 37 facts about Slovakia

The first edition took place on October 28, 1924, making it the oldest marathon in Europe. Since 1980, women have also participated in the marathon. After the Boston Marathon (April 19, 1897), it is the second oldest marathon in the world.