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Secrets of Alcatraz

Image Credits: UnsplashImage Credits: Unsplash
  • Alcatraz began as a 19th-century military fort and later became a federal prison housing infamous criminals like Al Capone and “Machine Gun” Kelly.
  • The 1962 escape by Frank Morris and the Anglin brothers remains one of America’s greatest unsolved mysteries.
  • Alcatraz has evolved into a wildlife refuge and symbol of Native American activism following a 19-month occupation in 1969.

[WORLD] Once a fortress of fear and isolation, Alcatraz Federal Penitentiary has captivated the world for decades. But beyond the infamous escape attempts and hardened criminals lies a history as complex as the currents that swirl around its rocky shores. Here are five lesser-known facts about America’s most legendary prison.

1. Alcatraz Was Originally a Military Fortress

Long before it became synonymous with maximum-security incarceration, Alcatraz Island served as a military fortification. In the 1850s, amid fears of foreign invasion during the Gold Rush, the U.S. Army fortified the island as part of a broader coastal defense system. It became the first operational lighthouse on the West Coast in 1854 and soon after housed artillery and troops. By the late 19th century, the island transitioned into a military prison used to detain Civil War deserters and other military offenders.

"Its remote location and strong currents made it ideal for a secure facility—even before federal use," says Dr. Timothy Newell, a historian with the National Park Service.

2. It Was Home to Some of America's Most Notorious Criminals—But Only for a Short Time

Though often associated with legendary gangsters like Al Capone, George “Machine Gun” Kelly, and Robert Stroud (the Birdman of Alcatraz), most inmates at Alcatraz were not household names. The federal prison operated from 1934 to 1963 and held just over 1,500 inmates in total.

The average stay? Less than 8 years.

“It wasn’t meant to be permanent,” says Deirdre McLaughlin, curator at the Alcatraz Island museum. “It was a last-resort facility for inmates who had caused trouble elsewhere.”

3. There Was an Escape—Possibly a Successful One

The idea that “no one ever escaped Alcatraz” remains a popular myth. In reality, 36 men tried to escape in 14 separate attempts. Most were caught or killed, but the 1962 breakout involving Frank Morris and brothers John and Clarence Anglin remains unresolved.

Using improvised tools and papier-mâché dummy heads to fool guards, the trio vanished through a ventilator and into the San Francisco Bay on a makeshift raft. While the FBI closed the case in 1979, declaring the men likely drowned, fresh evidence in recent years—including a 2013 letter allegedly from one of the escapees—has reignited speculation.

“It’s the great unsolved mystery of Alcatraz,” says retired U.S. Marshal Michael Dyke, who investigated the case for over 15 years.

4. Native American Activists Occupied the Island

In one of the most significant events in Native American civil rights history, a group of activists occupied Alcatraz from 1969 to 1971, claiming the island under a treaty provision that unused federal land could be reclaimed by Indigenous people.

The occupation drew national attention to Native American issues, with activists establishing a community, school, and cultural center during their 19-month stay. The federal government eventually removed the protesters, but the movement helped catalyze future legislation and awareness.

"It changed the conversation about Native sovereignty in the U.S.," says Dr. Marie Sanchez, professor of Indigenous Studies at UC Berkeley.

5. Nature Is Reclaiming Alcatraz

Today, Alcatraz is managed by the National Park Service and draws more than 1.7 million visitors annually. But beyond the prison walls, nature is quietly retaking the island. Alcatraz is a designated seabird sanctuary, home to species such as western gulls, cormorants, and snowy egrets. Endangered plants like the San Francisco wallflower are also being reintroduced.

“It’s become a haven for biodiversity,” says biologist Rachel Kaminski, who works with the Golden Gate National Parks Conservancy. “It’s an unlikely but vital habitat.”

A Legacy Beyond the Bars

From military outpost to infamous penitentiary, civil rights flashpoint to wildlife refuge, Alcatraz’s story is one of transformation. Its allure endures not just because of who was imprisoned there, but because of the layers of history hidden in every cell block, tunnel, and tide pool.

Whether visitors come for the legends or the landscapes, one thing is clear: Alcatraz remains an icon of America’s complex relationship with justice, resistance, and redemption.


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