Today's lecture focuses on the history of urban planning, particularly the development of public parks in the 19th century. The speaker highlights how parks like Central Park in New York were designed not just for recreation but also to improve public health by providing fresh air and green spaces in crowded cities. Importantly, the lecture notes that the original design included separate areas for different social classes, a feature that was later modified. The professor emphasizes that the initial funding came from private donors, not the government, which influenced the park's layout and accessibility.