Dallas has a reputation as a progressive city—always ready to build something new to replace the old. In the late 19th century, as Dallas became the transportation and commercial center for North Texas, brick and stone edifices supplanted the simple frame structures of the early days. By the 1920s, the city was the financial capital of the region and boasted the tallest building west of the Mississippi. In 1936, Dallas hosted the Texas Centennial Exposition in Fair Park, an ensemble of art deco buildings that is a National Historic Landmark. As business grew, so did the skyline. Today Dallas has a rich collection of historic buildings that chronicle the city's growth and progress.