The Marathon Dam, also known as the Marathon Reservoir, was constructed between 1926 and 1929 to address Athens' growing water needs. Located near the town of Marathon, the dam was a major engineering project of its time and marked the first large-scale infrastructure development in modern Greece. Built by the American company Ulen & Co., it created an artificial lake by blocking the Charadros River. The dam is 54 meters high and 285 meters long. Notably, it was faced with Pentelic marble—the same material used to build the Parthenon—symbolizing a link between ancient and modern Greece. The dam played a crucial role in the modernization of Athens, supplying clean drinking water for decades. Today, although no longer the city's primary water source, the Marathon Dam remains a symbol of progress and a popular destination for visitors, blending natural beauty with historical significance.

The Marathon Tomb, or Tymvos, is the burial mound of the 192 Athenian soldiers who died in the Battle of Marathon in 490 BCE. This pivotal battle saw the vastly outnumbered Athenian army defeat the invading Persian forces, marking a turning point in the Greco-Persian Wars and securing the survival of Greek city-states and their democratic ideals. According to tradition, the Athenians chose to bury their fallen on the battlefield—an honor typically reserved for heroes—rather than in the Kerameikos cemetery. The 9-meter-high earthen mound stands near the plain of Marathon, close to where the battle took place. Archaeological excavations in the 19th century uncovered cremated remains and grave offerings inside the mound. The Marathon Tomb remains a powerful symbol of bravery, sacrifice, and the defense of freedom. It continues to inspire visitors from around the world, standing as a solemn reminder of one of history’s most famous military victories.

The Temple of Artemis in Brauron (Vravrona) was one of the most important sanctuaries of Artemis in ancient Attica. Built in the 6th century BCE near the Erasinos River, it honored Artemis Brauronia, goddess of nature, hunting, and childbirth. The site was a major religious center for women and especially young girls, who took part in rituals known as the Arkteia, where they "played the bear" to honor the goddess and prepare for adulthood. The temple complex included a Doric temple, a sacred spring, a stoa, and a unique L-shaped building for festivals and ceremonies. Pilgrims from all over Attica came to offer dedications, especially garments of women who had safely given birth. The sanctuary declined after the 3rd century BCE, likely due to floods and later Roman influence. Rediscovered in modern times, the site offers deep insight into ancient Greek religion, female rites of passage, and the cultural role of Artemis in classical society.

The Archaeological Museum of Marathon, located near the historic battlefield, showcases the rich history of the Marathon area from prehistory to late antiquity. Opened in 1975, the museum houses artifacts from the Battle of Marathon (490 BCE), the Marathon Tomb (Tymvos), and the Sanctuary of the Egyptian Gods. Its five rooms display pottery, sculptures, inscriptions, and grave offerings. Highlights include the Marathon Boy, a bronze statue found in the sea, and funerary stelae from the Classical period. The museum also features finds from the Neolithic site at Tsepi and the early cemetery of the area, revealing Marathon’s importance long before the famous battle. With its rich collection, the museum connects visitors to the heroic past of Marathon, offering insight into daily life, religion, and warfare in ancient Greece. It stands as a tribute to both the legendary battle and the area's broader archaeological significance.

The Marathon Run Museum, located in the town of Marathon, celebrates the history of the Marathon race, inspired by the legendary run of the messenger Pheidippides from the battlefield to Athens in 490 BCE to announce victory over the Persians. The museum traces the evolution of the race from ancient legend to modern Olympic sport. Opened in 2004, it features over 4,000 exhibits, including rare documents, medals, uniforms, and memorabilia from Olympic Marathons and international races. A special focus is given to Greek Marathon legends like Spyros Louis, winner of the first modern Olympic Marathon in 1896. The museum also honors the spirit of endurance, peace, and international friendship that the Marathon run symbolizes today. Through its rich collection, it connects the ancient past with modern athletic achievement, making it a unique cultural and historical destination for sports enthusiasts and visitors alike.