From the Super Mario Wiki
The Cellar is a room found in Area Four of Luigi's Mansion.
There are some points of interest in the Cellar, most notably the two shelves. Each shelf has four tiers that can each be inspected for money, and one of the tiers will always have a 50-HP restoring Heart for Luigi. In addition to the shelves, several crates and barrels are placed around the room. About nine piles of dust are in this room, which need to be cleared every time Luigi wishes to traverse from one end of the room to the other, thanks to a large fence blocking off a direct path. There are also two Gravity Arrows underneath dust piles that allow Luigi to skip vacuuming.
There is a Speedy Spirit hiding in the crate near the entrance. It is behind the fence, but still easy to see.
 Ghosts in the Cellar
 Ghosts in the Cellar in the PAL Hidden Mansion
 Names in Other Languages