  In the last 43 years several hints were reported suggesting the existence of
granular superconductivity above room temperature in different graphite-based
systems. In this paper some of the results are reviewed, giving special
attention to those obtained in water and n-heptane treated graphite powders,
commercial and natural bulk graphite samples with different characteristics as
well as transmission electron microscope (TEM) lamellae. The overall results
indicate that superconducting regions exist and are localized at certain
internal interfaces of the graphite structure. The existence of the
rhombohedral graphite phase in all samples with superconducting-like properties
suggests its interfaces with the Bernal phase as a possible origin for the
high-temperature superconductivity, as theoretical calculations predict. High
precision electrical resistance and magnetization measurements were used to
identify a transition at $T_c \gtrsim 350~$K. To check for the existence of
true zero resistance paths in the samples we used local magnetic measurements,
which results support the existence of superconducting regions at such high
temperatures.
