Secret Sidewalk, Tourist attraction in Fremont, California, United States.
The Secret Sidewalk is a narrow concrete trail atop an old aqueduct that runs through East Bay parklands, offering views of meadows and remnants of early industrial infrastructure.
Built around the early 1900s by the Spring Valley Water Company, this aqueduct carried water from Calaveras Reservoir to San Francisco but operated for only about three years before being abandoned.
The site draws local graffiti artists, explorers, and curious visitors who treat the abandoned aqueduct as an informal trail, despite no trespassing signs marking the private property boundaries.
Access is technically restricted, and visitors should exercise caution due to uneven surfaces, open grates, and unstable sections along the route through the overgrown terrain.
The pathway features open holes and grates that reveal glimpses into subterranean passages below, adding an element of discovery to this concealed remnant of water engineering history.
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