Which parts of Bangkok would not be shown in a tourist brochures?

Parts of Bangkok not typically featured in tourist brochures include the sprawling slums and informal settlements, such as Klong Toey, where many locals live in challenging conditions. Areas like the dense, bustling markets of Talad Rot Fai or the back alleys of Chinatown may also be overlooked, despite their vibrant local culture. Additionally, the city's less glamorous industrial zones or outskirts, where day-to-day life unfolds away from the tourist attractions, often go unmentioned. These areas offer a raw glimpse into the city’s true character that many visitors may miss.