Rick Riordan said this quote
“ To call the place an anthill would be like calling the Versailles Palace a single-family home. Earthen ramparts rose almost to the tops of the surrounding trees--a hundred feet at least. The circumference could have accommodated a Roman hippodrome. A steady stream of soldiers and drones swarmed in and out of the mound. Some carried fallen trees. One, inexplicably, was dragging a 1967 Chevy Impala. ”