SAN FRANCISCO (KPIX 5) — Alcatraz has been considered by some to be one of the most haunted places in America. A couple of tourists said they have photographic proof.

More than a million tourists visit the former prison each year.

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A British couple snapped an eerie photo of what looks like a turn of the 20th century woman staring straight at their camera. The couple completely believes it was a spirit.

The picture was taken in the old visitation area of the prison, which had criminals on one side and visitors on the other, separated by thick bulletproof glass.

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Former Alcatraz prison guard George DeVincenzi, who worked on The Rock for eight years in the 1960s, told KPIX 5 that he thought it was shadows.

When asked if he experienced any ghosts at the prison, the guard said, “No. Personally I don’t believe in ghosts.”

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In its 29 years as a federal prison, there were eight murders on Alcatraz, zero executions, and no one was buried there.