Create an image of a vision board collage that encapsulates the concept of 'steampunk'. The vision board should feature numerous elements common to the steampunk aesthetic, such as gears, cogs, vintage machines, airships, Victorian-era clothing and architecture, and steam-powered inventions. The images should be arranged in an aesthetically pleasing manner, perhaps segmented into different sectors dedicated to different aspects of steampunk culture. It should look like a captivating and cohesive testament to the steam-powered industrial era, loaded with mystery, nostalgia, and a sense of adventure.