King Charles III was crowned on Saturday at Westminster Abbey, in a ceremony built on ancient traditions, at a time when the U.K. monarchy faces an uncertain future. More than 2,000 guests, thousands of troops, tens of thousands of spectators and a smattering of protesters converged in and around the abbey as the king traveled from Buckingham Palace in a gilt-trimmed, horse-drawn carriage. It was the final mile of a seven-decade journey for Charles from heir to monarch.