A list of the greatest summer blockbuster movies of all time has been compiled, although the exact number of films included varies. Some outlets have focused on specific aspects, such as monster movies or the most successful films of the last 20 years, while others have ranked the best summer blockbusters of certain time periods. The lists appear to cover a range of time frames, from the past 20 years to the past 50 years, and include films from the 21st century as well as earlier decades.