BARCELONA, Spain (AP) — The lengthy Las Ramblas promenade where a van plowed into pedestrians Thursday is a tree-lined walkway that starts in a huge plaza and ends near Barcelona's harbor. It's filled with cafes, restaurants, stalls selling everything from souvenirs to flowers, the city's famed opera house and a baroque palace. It stretches 1.2 kilometers (0.7 miles), with a pedestrian-only walkway in the center of the avenue and vehicle traffic allowed on both sides. Las Ramblas is one of Barcelona's top tourist draws, a place to stroll and soak in the city's historic charm while doing some serious people-watching.