Most footage of the International Space Station shows its exterior — solar arrays catching sunlight against the curve of the Earth. The walkthrough below takes a different route, moving through the interior module by module: the laboratories where experiments are run, the sleep stations the crew call home, and the equipment that keeps the station alive and working.
The station is a chain of interconnected pressurized modules contributed by the partner space agencies. Crew quarters, galleys, exercise gear, and dozens of experiment racks share the same volume; weightlessness turns every wall and ceiling into usable surface. Guided tours like this one are the closest most of us will get to seeing how seven people share a permanent home in orbit.