Japanese gardens feature extremely strongly. Is this due to where they tend to be built, something about their design, or some selection effect (ie bias in the data), or something else?
- a park with heavy foot/vehicle traffic that's half a mile from the intersection of two major interstates;
- an arboretum that's immediately adjacent to a major interstate beltway exit; and
- a beach surrounded by commercial development locally known for its active nightlife scene.
Perhaps just as ironic is a state park in an area known for its retired affluence---where the only major road is a 2-laner that's sparsely traveled---with a higher "quiet score" than 2 of these locations.