Underneath a freeway overpass in San Pedro, where the rumble of cars and semi trucks echoes from above, there is a hidden skate park. It’s both gritty and mesmerizing, made by a jumble of volunteer hands that have poured concrete, scooped out rain from the storms and artfully assembled every shiny tile of the decorative mosaics that cover the walls of this DIY playground. Get to know Los Angeles through the places that bring it to life. From restaurants to shops to outdoor spaces, here’s what to discover now. Gabriel Solis, a 59-year-old retired mason, has come to skate on an early Wednesday morning while his rescue dog watches. He hops off his board to take in the scene. “I’m an artist and this is my canvas,” he says. In a way, this underground refuge — the Channel Street Skatepark — feels like a symbol for San Pedro, a city where creativity and community seem to emerge in the most unexpected spaces. Solis, who’s lived there for 20 years, describes the neighborhood with words like …