Big Ben (Elizabeth Tower), London

Big Ben outperforms #5 Taj Mahal in clock accuracy: the Elizabeth Tower's Great Bell chimes with a margin of error under one second per day, making it the world's most precise four-faced chiming clock. Completed in 1859, the tower stands 96 meters tall and underwent a major restoration that lasted four years and cost £80 million, completed in 2022. Its clock mechanism, which uses a double three-legged gravity escapement, is 20% more reliable than the average 19th-century timepiece. As the most photographed structure in the United Kingdom, Big Ben endures as an unmistakable symbol of democracy, drawing millions of admirers each year and holding an accuracy standard rarely matched by similar landmarks.