Tonight , the ghost hunters Gail Porter and Chris Fleming probe for paranormal activity at the former federal prison -LRB- above -RRB- on Alcatraz Island in San Francisco Bay as part of a 12-hour '' Scariest Places on Earth '' marathon beginning at noon .
San Francisco Bay
Alcatraz Island
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PERSON
Gail Porter
LOCATION
Alcatraz Island
LOCATION
San Francisco Bay