Starting point - Sveta Nedelya Square, which is not only the center of the Roman city of Serdica, but is a unique place where operating temples of the four most widespread religions coexist peacefully. The walk leads to Roman ruins and after that like a time machine moves the guests into the end of 19th century, when the majority of the buildings in Bulgarian capital’s center had been constructed. And than again brings one deep into the past to the Early Christian Basilica of Saint Sofia, which has given the nowadays name of the city, and makes him emerge in 20th century to visit Saint Alexander Nevski Cathedral, connected to both medieval history of Bulgaria and restoration of Bulgarian State in late 19th century.