Screenshots from Zillow.com's "Heat Maps" for some of the largest metro areas in the US. Note that the basis is cost per square foot.

Unscientific rank: #1 San Francisco/South Bay, #2 Los Angeles, #3 NYC metro (Manhattan, Westchester/Hamptons/Fairfield CT), #4 San Diego, #5 Boston, #6 Seattle, #7 Chicago, #8 Phoenix.