The Zappeion (also known as Zappeion Mansion or Zappeion Megaron) is a neoclassical landmark in central Athens, constructed between 1874 and 1888 as the first building in the world specifically built to serve modern Olympic needs. Commissioned by the Greek philanthropist Evangelis Zappas, a wealthy businessman from North Epirus who spent much of his life in Romania, the building embodied his vision to revive the ancient Olympic Games and promote Greek culture. Evangelis Zappas dedicated his fortune to the rebirth of ancient Greek traditions, funding numerous important projects in 19th-century Athens. To expedite his plan for Olympic revival, Zappas immediately sent 2,000 Austrian florins to cover costs for what would become known as the First Zappeian Olympiad. The Greek government allocated a substantial plot of land inside the National Gardens for this ambitious project.

Designed primarily by Theophilos Hansen, the building features neoclassical architecture with a prominent Corinthian portico and a symmetrical plan organized around a circular atrium. Hansen also designed the surrounding gardens, with initial plantings beginning as early as 18576. Architectural historian Constantine E. Biris noted that French architect Desire Matton later incorporated some changes to the garden design. The Zappeion was officially inaugurated with a full ceremony on October 20, 1888. From its inception, the building served multiple purposes: as an exhibition hall for Greek agricultural and manufactured products, a venue for introducing new technologies to the Greek public, and as a space for cultural events including art exhibitions and musical performances.

During the first modern Olympic Games in 1896, the Zappeion played a direct athletic role, serving as the main fencing hall with matches held in its atrium. This established its integral connection to the Olympic movement that continues today.

The building underwent significant renovation in connection with the 2004 Athens Olympic Games, ensuring its continued relevance for modern Olympic events. During those Games, the Zappeion again served as a venue, maintaining its historic connection to the Olympic movement.

Today, the Zappeion operates as a premier conference, exhibition, and cultural center, hosting events ranging from scientific seminars to international conferences. Its location in the historic center of Athens, adjacent to the National Gardens and near the Panathenaic Stadium, offers easy access to the city’s most important archaeological sites.