The 12-story building in Texas has been abandoned since 2002.
The helicopter was designed to demonstrate the viability of controlled, powered flight on other planets.
The rover is scheduled to touch down on the red planet in 2021.
The migration is the biggest since 2005, when experts estimate more than a billion insects flew over the state.
"The man asked if me and my little girl had showered before getting into the pool because people carry diseases into the pools and he doesn't want the health department to shut the pool down."
A signal from NASA's Dawn confirming the first-ever successful entry into orbit of a dwarf planet came back at 8:36 a.m. on Friday.