The Brotherhood Cairn (also known as the Pantheon) is a majestic memorial complex located in Bulgaria's second-largest city, sunny Plovdiv. This monumental site is an outstanding example of architecture from the second half of the 20th century, dedicated to the memory of those who fell for the country's freedom across different historical periods—from the struggle against Ottoman rule to the events of World War II.

The exterior of the structure is highly symbolic: when viewed from above, its outlines resemble a stone wreath, while the construction itself is inspired by the shape of ancient Thracian tombs, which are abundant in this region. The central part of the composition stretches for 90 meters, forming an impressive ensemble of concrete, limestone, and bronze created by a team of masters under the leadership of architect Lyubomir Shinkov.
Today, the memorial serves not only as a place of remembrance but also as a significant cultural landmark for the city. Although the eternal flame that once burned at the center of the complex is no longer active, the "Brotherhood Cairn" remains an emblematic location in Plovdiv, attracting history buffs and fans of monumental art with its austere beauty and philosophical atmosphere.