If you maintain property directly behind your property line, is there such a law that you own that property?

Yep, It's all yours.......................................Until somebody can prove different. See it costs a lot ($500) for a property surveyer to come out and survey it. All you need to do is act like it's yours and nothing will be the difference. Enjoy and I give all the royalties to charity.

You are speaking of a legal concept in property law referred to as "adverse possession" In New Hampshire, the code (C. 508, §2.) the time is 20 years but with many elemnts that must be met.
To make a claim for adverse possession, the claimant must have acted as if he is the true owner of the property. The claimant must possess the land to the exclusion of all others. You have to keep people off and openly declare it to be your property. The plaintiff must possess the land conspicuously, that is doing things on the property that would show the world that he owns the property (such as building a house, logging or farming, planting a hedge or building a fence, just mowing it has been held by the courts to not be enough).

Further, the claimant must possess the land adversely to the actual owner. This means that the adverse possessor cannot be occupying the land with the permission of the owner. The adverse possessor and the actual title owner are often both under the mistaken belief that the adverse possessor owns the land and therefore the title owner is not giving permission to use land he does not believes he owns. Furthermore, the adverse possessor as acting as the title owner because he believes he is the title owner.
The adverse possessor must do all of the above actions continuously for a period of twenty years.

To jjluther: to ask for votes is a violation of WebAnswers policy

Put yourself in Aldo's shoes for a few minutes, then answer.
For the past 13 years. I have always maintained the land directly behind my property. Is there a law stating I can claim it as my own?

It is impossible for him to take ownership (Maybe a sneaky, underhanded "Quick Claim Deed" with an ad in the paper and all the legalities) of the property in any legal way, even if it is 50 Years, so in all respect, my suggestion would be the most beneficial and least instigating, because it is the SOLUTION, without breaking any laws.
The questioner did not ask to build a garage on that strip of land. THEN, therefore that would be a problem, and a whole new question..

What the last poster stated as "answer" has no legal basis in law whatsoever; as quit claim deeds must be signed by the legal owner. You answer makes no sense and shows no understanding of porperty law whatsoever.

Lluther19; I didn't "mis read" anything . attempting to influence the askers choice of answer by a personal plea for charity is asking for the award, and a violation
or we would all just do that:
i need moieny for my rent; my kids are hungry, i support a local animal charity, etc the answer is supposed to be awarded based on accurate helpful information, not on what you will do with the money or your "winnings" as you put it in another answer.

Lighten up ! People have signed things that they do not fully read all the time. Sorry I knocked your answer that did not make much sense either, (20 years but with many elemnts that must be met.)

Would one of those elements be a signature on something?
What is your bar going to say about your actions here?


Be careful out there, it's a jungle.

Jjluther19: save your threats.
if my answer didn't make sense to you , that is because you do not understand the law; i cited the NH state codem, perhaps you could look it up and read it for yourself so you will understand that it requires" 20 years and many other elemets " means