It doesn't get much more phallic than the Nebraska State Capital Building. Widely known as "The Penis on the Prairie" it BEATS THE PANTS OFF OF EVERY LAST ONE OF YOUR LAME ASS PHALLIC SYMBOLS
Why you ask? Because it's topped with a 19 ft tall statue known as "The Sower" who is throwing out seed. Tell me that doesn't fit into the whole phallicness of the building, I mean seriously - a tall skinny building with seed being thrown out the top!