This illustration was done in 1925 for Popular Science Monthly. It looked just 25 years into the future, and saw something grand:

Future city streets ... will be in four levels: The top level for pedestrians; the next lower level for slow motor traffic; the next for fast motor traffic; and the lowest for electric trains. Great blocks of terraced skyscrapers half a mile high will house offices, schools, homes, and playgrounds in successive levels, while the roofs will be aircraft landing-fields...

Such optimism. Such faith in progress and civil engineering. So wrong.

What will the world look like 25 years from now?