Editor's Note: This article was originally published in June 2012 and has been updated with the most recent information. After the construction of the Bay Bridge in 1933, San Francisco began considering duplicating the bridge and running a second one further south across the bay. Enter Frank Lloyd Wright, a little-known architect whose idea and design for a second Bay Bridge never came to fruition. The noted architect hated the idea of a second steel structure similar to the San Francisco–Oakland Bay Bridge. Partnering with engineer Jaroslav J. Polivka, Wright proposed a concrete "Butterfly Bridge,” spanning from Army Street (now...