The home in Oxford where Tolkien lived from 1930-1947 and where he wrote parts of The Hobbit and The Lord of the Rings is on the market for 6 million.
The house and grounds are breathtaking.
Here is a link for more pictures of the home.
Sadly, there are no round doors in the home. However, as shown in this one photograph, there is something magical about a door leading to the writing room of JRR Tolkien.