Detroit is full of history, grit, and surprises. Here’s Part 4 with more facts you might not know: 🎨 The DIA was the first U.S. museum to buy a Van Gogh 🌉 The Ambassador Bridge is one of the busiest border crossings in North America 📬 Detroit has the only floating post office in the U.S. ZIP code is 48222 🌊 The Detroit Riverfront project is one of the largest public and private waterfront redevelopments in the country 🍕 Detroit-style pizza started in blue steel pans from the auto factories