A floating spaceport in Japan could bring space travel to the city. A group of designers and architects are working on a four-story, futuristic spaceport city that floats in Tokyo Bay. [TRENDING: COVID-19 closes early voting location | Can you get COVID-19 twice? But it is not the first urban spaceport project. In Houston, the home of NASA’s astronaut program at Johnson Space Center, work is underway to transform a former airport into a commercial spaceport.