Monument Peak, Mountain summit in Milpitas, United States.

Monument Peak is a summit in the Diablo Range on the border between Alameda and Santa Clara counties, rising to 768 meters. It stands on a ridge with Mount Allison and Mission Peak, and its top lies just inside the southern edge of Mission Peak Regional Preserve.

The summit changed significantly in 1988 when a broadcasting antenna was built on its peak. This structure has remained a defining feature of the landscape ever since.

The summit marks a natural boundary between two counties and serves as a geographical landmark that locals recognize and use for orientation. People regularly visit this place for hiking and outdoor recreation.

Access to the summit is through a hiking trail starting at Ed R. Levin County Park, covering about 10 kilometers round trip. The climb is steep and requires good fitness and proper footwear.

A 184-meter-tall antenna stands on the peak and has been transmitting television signals across a wide area for decades. This structure is among the tallest built forms in the region and dominates the summit profile.