This is using Shiller's more accurate repeat sales method instead of median prices. You can see how house prices go up because everything goes up. This is called inflation.
Shiller made another study of repeat sales of identical properties along the canals in Amsterdam. This is also pretty fascination. There is no upward trend once corrected for inflation though there is lots of variation tracing the history of Holland. Here is a version in Dutch.
This is Bob Shiller's famous plot of the US housing bubble.
