There's little consensus when it comes to debating the oldest drinking establishments in San Francisco. Different lists will give you different answers. But by all accounts, Shotwell's, a cherished Mission institution, is at least the fifth-oldest bar in the city. The saloon has stood at the corner of Shotwell and 20th streets for the past 135 years, an after-work oasis for generations of San Franciscans. During busy hours, the party pours out onto the tree-lined sidewalk and parklet.