I've recently been to Providence, RI. For a hard-core fan of Lovecraft's works it's a moving experience...
Lovecraft's house from 1926 to 1933
Ward house, from The Case of Charles Dexter Ward
The Shunned House
Fleur des Lys Studio, home of artist Henry Anthony Wilcox in The Call of Cthulhu
Sorry for the crappy quality and huge size of the photos.