The Green Tomb (Yeşil Türbe) stands on the hill above the Green Mosque and contains the sarcophagus of Sultan Mehmed I. The exterior is clad in turquoise tiles — deep green-blue hexagonal faience that gives the building its name and makes it visible from across the valley. It was built between 1421 and 1424, shortly after the sultan's death.
The interior is simple but powerful: the cenotaph (a decorative cover over the actual burial vault below) is enormous, draped with embroidered cloth and surrounded by fine tilework panels. The tombs of Mehmed's children are arranged around the walls. The building is octagonal — a form the Ottomans borrowed from Byzantine and Seljuk funerary architecture — and the tile panels around the windows are some of the finest examples of early 15th-century Iznik production.