A few nations are embarking on expensive megaprojects with technologies that must be seen to be believed.

Saudi Arabia is developing a $500 billion city with robot workers and drone taxis, while India is installing digital cubes that beam videos to the public.

These billion-dollar developments are blurring the lines between reality and science fiction.

Cities may be a long way from hovercrafts and Hyperloops, but they're slowly catching up to the visions of science fiction.

Technologies that once seemed impossible, like driverless cars and drone taxis, are now popping up mega-developments around the world.

By designing cities from scratch, nations like India, Saudi Arabia, and the US can accommodate new innovations in infrastructure and deliver services more efficiently to residents.

Take a look at the development projects that are blurring the lines between reality and science fiction.