my %table = (
    Germany => {
        Frankfurt => {},
        Berlin    => {
            Wedding   => {},
            Koepenick => {},
            Kreuzberg => {},
        },
    },
    Finnland => {
        Hellsinki => {},
        Oulu      => {},
        Salo      => {},
        Tampere   => {},
    },
    USA => {
        CHicago    => {},
        Washington => {},
        'New York' => {
            Manhatten => {},
        },
    },
);