Zillow.com is a free website that will tell you the value of y our home or the home values of any area in the US that you are interested in. It's really easy to use and really is free. Zillow is essentially a real estate search engine.
Once you type in your address, or any address for that matter, they will provide you with information including home value, number of bedrooms, number of bathrooms and square feet. Regarding the home values, Zillow provides a predicted home value as well as a range.
The graph I'm showing here (click to enlarge) is actually the home value of the Brady Bunch house tracked over the past 10 years. You can see the house is now worth about $1,000,000 and has appreciated by about $600,000 over the past 3 years.
Zillow provides aerial pictures of the homes and also offers "bird's eye" views of the homes from North, South, East and West at a tilted angle so that you can actually see what a house really looks like.
Here are links for some other famous houses in Zillow, including the Beverly Hillbillies mansion, Playboy Mansion, Beverly Hills 90210 home (which is actually in Altadena, California, adjacent to Pasadena), Six Feet Under home, Happy Days home, Ozzy Osbourne's MTV home, Friends apartment building, and apartment building next door to Cheers bar.