The appearance of urban areas manifested by human congregation and concentration is a phenomenon characteristic of the development of modern humankind. Historically, every ancient high culture was based on large agglomerations of people (e.g., Angkor Wat, Machu Picchu, Alexandria). Human concentration in urban areas offer a lot of advantages to those in areas with less benefits, especially rural areas. Urban areas provide economic welfare, efficient communication and transportation paths, a dense social and healthcare network, and numerous entertainment opportunities compared to remote and sparsely settled areas. Urban areas today provide home to more than 50% of the people worldwide. Urban areas display strong growth trends, especially in less-developed countries, where a rapid growth of unplanned informal settlements are evident.