The phrase "to walk the halls" means to navigate or move around inside a building, typically a school, office, or similar place, by walking the corridors or passages within it.
Sentences with «to walk the halls»
How do I know that sex offenders aren't walking the halls of my child's school? (educationworld.com)
Turns out that we couldn't walk the halls, as the monitors weren't picking things up right. (pistachioproject.com)
People walk the halls at all hours of the day, and crew members are never more than a stone's throw away. (wanderlustwayfarer.com)