Sofia is a city with a rich history that spans thousands of years, having been home to Thracian, Roman, Byzantine, and Ottoman civilizations. This deep history is reflected in the numerous historical landmarks scattered across the city.

The Ancient Serdica Complex: Located beneath the central parts of Sofia, this complex represents the remains of the Roman city of Serdica, a vital trade and strategic center. Visitors can explore preserved streets, buildings, public baths, and residential structures, offering a glimpse into the city's Roman past.

The Western Gate of Serdica: Recently unearthed, the Western Gate is part of the ancient fortress walls of Serdica. It is one of the few remaining fortifications that survived and showcases the city's importance during the Roman era.

The Rotunda of St. George: Built in the 4th century, the Rotunda is one of the oldest preserved buildings in Sofia. It has witnessed various eras, serving as a Roman church, an Ottoman mosque, and a Christian chapel once again. The medieval frescoes inside are a stunning example of Byzantine art.

The National History Museum: As the largest museum in Bulgaria, it houses some of the most significant artifacts from Bulgarian history, ranging from prehistoric times to modern day. Highlights include Thracian treasures, Byzantine relics, and items from medieval Bulgarian kingdoms.

The Central Mineral Baths: Built in the early 20th century, this building is an architectural gem and a symbol of Sofia's history as a spa destination since Roman times.