SELECT "Circuit" FROM table_54770 WHERE "Fastest lap" = 'phil hill'
What is the name of the circuit when Phil Hill has the fastest lap?
CREATE TABLE table_54770 (
    "Race" text,
    "Circuit" text,
    "Date" text,
    "Pole position" text,
    "Fastest lap" text,
    "Winning driver" text,
    "Constructor" text,
    "Tyre" text,
    "Report" text
)