Here’s a cool rotating gif map on rising U.S. land prices based on data taken from the Lincoln Institute of Land Policy  (in partnership with University of Wisconsin-Madison).
I’ve used their data for my Bloomberg View column  talking about the price of land. In short, the land is what appreciates, not the improvements to the land such as the house itself. The price of land is a key issue in the U.S. affordable housing crisis we are now experiencing.
Here’s a 40 year view on the price of land  for residential development provided by Howmuch.net
Source: Howmuch.net