Alcatraz

Alcatraz operated as a maximum-security federal penitentiary from 1934 until its closure in 1963, housing notorious inmates including Al Capone and Robert "Birdman" Stroud. Its defining mystery began on the night of June 11, 1962, when inmates Frank Morris and brothers John and Clarence Anglin used sharpened spoons to dig through ventilation shafts, left papier-mâché dummy heads in their bunks to fool patrols, and launched a raft made from stolen raincoats into San Francisco Bay's frigid currents, and were never seen again.

The FBI and National Park Service's official position is that the men most likely drowned in the bay's cold, fast-moving currents, but no bodies were ever recovered, leaving the case formally "presumed drowned" rather than closed. Decades later, family members surfaced letters and a photograph allegedly showing the Anglin brothers alive in Brazil in the 1970s; the U.S. Marshals Service investigated the photo without reaching a conclusion. Separately, generations of guards and visitors have reported disembodied screams, clanging cell doors, and unexplained cold spots in cellblock D, particularly cell 14D, along with phantom banjo music attributed to Al Capone, who was permitted to practice the instrument there.

A 2014 Dutch researcher's tidal modeling found that, with a midnight departure timed to outgoing currents, a raft could plausibly have reached the Marin headlands rather than being swept out to open sea, supporting survival as physically possible without proving it happened. The ghost reports have no investigation behind them beyond ghost-tour tradition; mainstream histories of the prison document only the escape and its operational history, treating the haunting claims as folklore layered onto a building with a uniquely grim, claustrophobic past.

Reachable only by ferry from Pier 33 (Alcatraz Landing); tickets are sold exclusively through the National Park Service's official ferry concessionaire. Book well ahead. Sailings sell out, especially on weekends.