Article Detail Which is Largest library in the world ? Answer: United State Library of Congress, Washington D.C. Similar Questions : 1. Which is the biggest country in Area ? Answer: Russia 2. Which is the longest Platform ? Answer: Gorakhpur railway station, Uttar Pradesh, India (1355.40 meters) 3. Which is the longest day in the year ? Answer: June 21 4. Which is smallest planet ? Answer: Mercury 5. Which is the largest sea in the world ? Answer: Philippine Sea 6. Which is biggest planet ? Answer: Jupiter 7. Which is the brightest planet ? Answer: Venus Read more from - Longest and Largest