The Tachara, Taçara, Tachara of Darius, Tachar Château, Mirror Hall or exclusive palace of Darius I is one of the interior Persepolis Palaces. The meaning in olden Persian is wintry home. The palace is made of gray stone. It was built by Darius I but only a small portion of the palace was finished under his rule, and it was completed after his death in 486 by his son and successor Xerxes I, who called the house a Taçara, winter palace. Artaxerxes I continued to use the palace. Its ruins are immediately south of the Apadana.
Like many other parts of Persepolis, Tachara Palace has reliefs of tribute-bearing dignitaries. This palace was one of the few structures that escaped destruction in the burning of the complex by Alexander.
The Tachara, measuring 1,160 square meters (12,486 sq. feet), is the smallest of the palace buildings in Persepolis. Its main room is a mere 15.15m x 15.42 m (49.70 ft. x 50.59 ft.) with three rows of four columns.
The name Tachara was chosen by Darius I for his palace, the first completed structure on the Terrace before his death. It stands back to back to the Apadana and is oriented southward. The Tachara's function, however, was more ceremonial than residential. Upon completion, it served in conjunction with the earlier south oriented entrance stairs as the Nowrouz celebration venue until the other buildings that would comprise Persepolis could be finished, a provisional union of the Apadana, the Throne Hall, and a Banquet Hall.
As the first of the palace structures on the Terrace, the Tachara was constructed of the finest quality stone. The surface was almost completely black and polished to a glossy brilliance. This surface treatment combined with the high quality stone is the reason for it being the most intact of all ruins at Persepolis today. Although its mud block walls have completely disintegrated, the enormous stone blocks of the door and window frames have survived.