Design an engaging YouTube thumbnail for a World War II Full Timeline video by creating a dynamic collage. Incorporate iconic images representing key events, such as soldiers in action, historical figures, and significant landmarks from different stages of the war. Use a bold and contrasting color scheme to catch viewers' attention, and include a captivating title with a mix of historical fonts. The goal is to visually summarize the vast timeline of World War II, enticing viewers to explore the comprehensive historical content in your video.