My first job at of college was working at the Folger Shakespeare Library in Washington, DC.
I spent half my week attending to readers in the reading room helping them use finding aides, the room-sized art card catalogue, the OPAC, foam cradles and book weights. The other half of the week I re-housed materials, and fetched (yup, official job description) rare materials from the vaults underground and once again, various projects around the library.
The best part of working there was hearing just how excited readers would be when they found something they were looking for. The worst part was walking into the humidity of the summer air in DC after working all day in climate control: the water in the air condescend on your skin!