Eureka Valley ?? Noe Valley ?? Dolores Heights??

Am I tripping or does this look out of place in the middle of San Francisco? So tranquil and fairy tale like. The gates were ajar when we arrived, no joke.  With Sutro Towers in the background you must know it's in the city. It's on top of a hill I don't know the name. It divides Eureka Valley from Noe Valley along 21st Street and Collingwood. Anyone know the name of this hill?