The Three Great Divine Temples: Arranged side-by-side, forming the heart of the city, these three monumental temples are Letoon's most magnificent structures. The Temple of Leto, located in the west, is the largest and was built in the noble Ionian order. In the center lies the smaller Temple of Artemis, dedicated to the goddess's children, and to the east, the Temple of Apollo, adorned with exquisite floor mosaics. These three temples represent the clearest vision of ancient religious architecture in the Mediterranean.

The Memory Stone: Birthplace of the Trilingual Inscription: The "Trilingual Inscription"—one of the greatest discoveries in world history, now protected at the Fethiye Archaeology Museum—was found right near the Temple of Apollo in this sacred area. The fact that the official language of the Lycian League was carved into stone alongside Greek and Aramaic makes this site the heart of ancient diplomacy and multiculturalism.

The Great Water Temple (Nymphaeum): Located just behind the temples, this massive monumental fountain building was constructed over the sacred spring where, according to mythology, the goddess Leto bathed her twins. Even today, during winter and spring, the rising groundwater transforms this sacred area into a natural pond, lending a fairytale-like atmosphere to the ruins.

Stage of Sacred Festivals (The Theater): Beyond classical plays, Letoon’s massive theater was a grand public space where delegates, priests, and the public from all Lycian cities gathered for religious ceremonies, sacrificial rituals, and federal celebrations.