  We study the optical appearance of Schwarzschild-de Sitter and
Reissner-Nordstr\"{o}m-de Sitter black holes viewed by distant observers inside
cosmological horizons. Unlike their asymptotically flat counterparts, due to
the positive cosmological constant, there are outermost stable circular orbits
in the spacetimes, resulting in significant outer edges in the images. Besides,
when the Reissner-Nordstr\"{o}m-de Sitter black hole has a stable Cauchy
horizon, the photons from the preceding companion universe can be received by
the observer in our universe. These rays create a multi-ring structure in the
image. Since the stable Cauchy horizon violates the strong cosmic censorship
conjecture, this novel image shed some light on the test of the conjecture by
astronomical observations.
