Love Philly? So do we. Let’s be friends. Sign up for the Billy Penn newsletter today. Beyond the famous colonial-era sites that fill Old City, Philadelphia’s streets hold a wealth of stories and heritages to explore. Various tour companies offer itineraries that give a chance to stroll through different neighborhoods — Chinatown, South Street, North Broad, sections of West Philly or North Philly — while learning about the many different cultures…