I do a variety of archaeology at my house. There's an old garbage pile at the bottom of a drainage that silted up over the years. I deflect winter runoff through it in various ways to expose the stuff. It's mostly bottles from the '40s so far, but the place has been occupied for about 100 years, so I'm hoping for more interesting stuff as the pile wears down.
Hey, you've just described my living room. ;') On a lesser note, my mom had some old cans and bottles with various paints and so forth. We took them over to the waste handling shack the county maintains out there. I pulled two of them out -- one was an old-fashioned brown glass "Roman Cleanser" gallon jug, with (I think) turpentine inside, the other a Listerine bottle with (perhaps) really old Listerine inside. Those old bottles are cool (not just due to their scarcity), with those raised letters. That kind of thing is mostly unheard of today, except perhaps for $5 - $6 jars of spaghettis sauce or somethin'.