The most highlighted construction of the temple is the Garuda dhvaja sthambam or flagstaff of Garuda, the majestic eagle mount of lord Vishnu. This monolithic structure is completely built from black granite and elevated 53.5 feet above the ground with its lower end touching water table. Constructed in 57 BC, this structure was also built in a single night along with the outer wall. And an amazing fact is that no black granites can be found in an area ten miles around the temple. A 3 feet massive idol of Garuda is placed on the top of it facing the main sanctum. Since this flagstaff started slanting and reached its current position, a three tiered copper roofed construction has been made all around it to prevent further slanting. West to this, currently used golden flagstaff can be seen.