Bhumibol Adulyadej, Thailand’s king and the world’s longest-serving head of state, turns 85 years old today. King Bhumibol, also known as Rama IX, has ruled Thailand for more than 66 years, and is a popular figure throughout the country. Many Thais, clad in yellow—a color symbolizing devotion to the king—have camped for days in Bangkok's Royal Plaza in anticipation of the day’s festivities, which will include fireworks, thousands of vividly colored marigolds, and a performance by Korean pop singer Psy. Click the blue location link above to see more photos shared from the Royal Plaza. Photo by @thenotee.