Home to both sea and land
it could be seen by one on the holy height
built for those who left and came home again
it was known from afar by the great white sight.
Avallonne
Spelled wrong in the riddle? If Avallonne does not not, try Avalone. I believe that Bobbins just had a typo listed.
Avallónë was a city and seaport on the eastern shore of the island of Tol Eressëa (Source: The Silmarillion).
Tolkien Gateway: Avallónë
Confirmed as 'Avallone'