Commanding a hillside terrace above the city, Yesil Camii takes its name from the green and blue tiles in the interior. Intent on leaving his mark on Bursa, Mehmet I ordered the construction of this mosque, built entirely of hewn stone and marble, as a monument to the victorious ending of his 10-year struggle for the throne. Although an architect's inscription over the portal gives the completion date as 1419, the final decorations were ordered in 1424 on the orders of Murad II, and the two minarets were added in the 19th century.

One of the first mosques to employ an inverted T floor plan, the building signals the dawn of a new Turkish architectural tradition. The "Turkish pleat," an ingenious geometric corner detail allowing for the placement of a circular dome atop a square base, is a design device original to Turkey, while the use of multicolored ceramic tile, an influence that arrived with Tamerlane, is intricate enough to make your head spin. The high porcelain mihrab (a niche oriented toward Mecca) is a masterpiece of Ottoman ceramic art, difficult to miss at an understated 10m (33 ft.) high. In the center of the mihrab in Arabic script is the word "Allah," mounted on the wall at a later date.

The sumptuous gold mosaics and tile of the Imperial loge were probably an overstated attempt at one-upping the loggia that served the Byzantine emperors; it is flanked on either side by the servants' quarters and the harem, and a closer look is at the discretion of the caretaker.