The Interval at Long Now, Bar and library in Fort Mason, San Francisco, United States.
The Interval is a hybrid space that combines a library, full-service bar, and event venue inside a converted military building at Fort Mason. The interior merges shelves of books focused on long-term thinking with a working cocktail bar and displays of mechanical clock mechanisms.
The Long Now Foundation created this venue by repurposing a military building in Fort Mason into a space for intellectual exchange. The transformation reflected the foundation's mission to encourage extended thinking about humanity's long-term future.
The space brings together thinkers, writers, and creators who explore humanity's path forward through conversation and shared ideas. Visitors can experience discussions that examine how people might live and thrive across centuries to come.
Hours of operation change throughout the week, so check ahead before your visit to confirm when the space is open. The location sits in Fort Mason, which is accessible by public transit and offers free parking for those driving.
The library displays working prototypes of a mechanical clock engineered to theoretically function for 10,000 years. The shelves also hold an extensive collection of recordings documenting thousands of human languages from around the world.
Location: San Francisco
Operator: The Long Now Foundation
Address: Center Building A, 2 Marina Blvd, San Francisco, CA 94123, USA
Opening Hours: Monday 17:00-22:00; Tuesday-Friday 10:00-23:00; Saturday 15:00-23:00; Sunday 15:00-22:00
Phone: +14155616582
Email: info@theinterval.org
Website: https://theinterval.org
GPS coordinates: 37.80677,-122.43213
Latest update: December 6, 2025 19:10
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