Curious City is a news-gathering experiment designed to satisfy the public's curiosity. People submit questions, vote for their favorites, and WBEZ reports out the winning questions in real time, on Facebook, Twitter and the timeline above.

Rachel Kimura from Avondale is curious to know: "Where are the area’s oldest diners and what are their stories?" WBEZ food blogger Louisa Chu takes a slice of pie out of this one. Where is the oldest diner in your area? How has it changed over the years? Comment below!