The Araguaia Palace designed by the architects Maria Luci da Costa and Ernani Vilela is the seat of government of the Brazilian state of Tocantins. It is located in the city of Palmas, the state capital. Seat of the state executive power, the Araguaia Palace is a landmark from where the streets and avenues of the capital were designed. It is located in the Square of the Sunflowers, this located in the center of the master plan and occupies a useful area of 14 thousand square meters, considered the largest public square of America and second largest of the globe. Imposing, with four floors, one underground. Its arches are a historical reference to the Church of Our Lady of the Rosary of the Blacks in Nativity. Of bold architecture, the Araguaia Palace is the main postcard of Palmas, and accompanies the modernity project of the capital of Tocantins.