  We suggest that the seven radio-quiet isolated neutron stars observed with
ROSAT are young cooling objects associated to recent near-by supernova
explosions which formed runaway stars and the Local Bubble, affecting the
topology of the interstellar medium in the vicinity of the Sun (within a few
hundred parsecs). In the aftermath of these explosions, a few black holes might
have been formed, according to the local initial mass function. We thus discuss
the possibility of determining approximate positions of close-by isolated black
holes using data on runaway stars and simple calculations of binary evolution
and disruption.
