The moving sidewalk shown, with parallel sections at different speeds, follows the design from the Paris Exhibition of 1900.[1] It seems to have worked well there, but nothing like it was ever built again. That moving sidewalk is not a belt; it's an endless train of flatcars with turntables between them.
It's disappointing that someone hasn't built a glass-roofed city by now. Google was getting close in 2015, with their glass-roofed campus plan, but the city of Mountain View decided not to let them build it. Google admitted that the roof technology wasn't proven yet.
The USSR built an armed cruiser that can move from the sea to land - the Zubr class hovercraft. Not for evading an enemy, for invading the land.
It's disappointing that someone hasn't built a glass-roofed city by now. Google was getting close in 2015, with their glass-roofed campus plan, but the city of Mountain View decided not to let them build it. Google admitted that the roof technology wasn't proven yet.
The USSR built an armed cruiser that can move from the sea to land - the Zubr class hovercraft. Not for evading an enemy, for invading the land.
[1] https://www.youtube.com/watch?v=BjpCVQgKZsc [2] https://www.youtube.com/watch?v=VJ0aqx6_5YE