The turn of the century brought new development, urban planning, elevated railroads, new bridges, and immigration laws. The building of the New York City Subway opened with the first IRT line in 1904. Many of the island’s subway lines were elevated above the streets rather than hidden underground. The total population of the city was around 3.4 million in 1900. By 1920, the number of foreign-born immigrants surpassed 2 million, which was more than one-third of the city’s total population. The 20th century also brought some disastrous events, such as the General Slocum fire, which killed over one thousand German ethnics, and the Triangle Shirtwaist Factory fire in Greenwich Village, which took the lives of 145 people. These events led to great advancements in the city’s fire department, building codes, and workplace regulations. Take a look at these colorful images that give us an idea of what life was like at the beginning of the 20th century — how landmarks, buildings have changed or been demolished. These photographs were produced by the Detroit Publishing Company using the photochrom process. Vote your favorites, and don’t forget to share. Also, check rare historical photos that give a glimpse of New York in the late 19th century.