Subterranean Sites in Fremont

Discover 1 unusual subterranean sites in Fremont.

Permanently Closed

Fixtures from the "sidewalk's" former use as a working aqueduct can still be found along the path

Fremont, California

The Secret Sidewalk

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

Are we missing something unusual in Fremont?