President Trump is dreaming of reopening Alcatraz as a prison, but making it happen could fare more like a nightmare with a really expensive price tag. Why it matters: The project, which would heavily alter San Francisco's landscape and tourism economy,

At the beloved attraction in San Francisco Bay, visitors could scarcely believe President Trump had suggested turning Alcatraz back into a penitentiary.

Alcatraz welcomes 1.2 million visitors a year and generates over $60 million in revenue for the National Park Service.