Albion Castle: San Francisco's Secret Medieval Brewery and Aquifer

Why It Stands Out

The architecture itself is a marvel of resourcefulness, constructed from heavy stones originally used as ballast on cargo vessels. Burnell modeled the tower after the ancient fortifications of his homeland, creating a petite but imposing landmark on what was then the city's outskirts.

However, the castle’s most impressive feature lies beneath the surface. Deep under the stone foundations, Burnell carved out two massive cisterns.

These 200-foot-long subterranean pools collect thousands of gallons of pure spring water every day, a resource that has remained remarkably clean for over a century. The property’s survival is as dramatic as its design.

When Prohibition shuttered the brewery in 1919, the site transitioned into a water bottling plant. Decades later, in 1961, the castle faced demolition to make way for a new highway.

It was spared only after advocates argued that the underground spring represented a vital asset for survival—specifically, a protected reservoir that would remain potable even after a nuclear disaster. Since then, the interiors have been refined with medieval-style woodwork by sculptor Adrian Voisin, and the property has served as an artist's retreat and a private residence.

Before You Go

Today, the castle is owned by a private investor and is generally closed to the public. While it is no longer a functioning brewery, the current management occasionally makes the space available for select private gatherings.

There are ongoing discussions regarding the revival of the historic water-bottling operation to tap back into the ancient spring that first inspired Burnell to build his stone sanctuary.