The line outside the Royal Palace on Calea Victoriei began to grow even before the hearse carrying the the coffin of the late King Michael left Castle Peles for the two hour drive to Bucharest.
King Michael will lie in State in the Throne Room at the Royal Palace through Saturday morning.
By Thursday evening tens of thousands of people have come through the palace doors to their respects to their much loved and respected King, who was forced to abdicate on December 30, 1947.
The Royal House's press office announced that the palace will remain open throughout Thursday night and will remain open until 10:00 p.m., on Friday.
The Romanian philosopher Mihail Sora was the first to enter the Hall of Thrones on Wednesday night at 7:00 p.m. He left a message in the book of condolences. "Deeply grieved, to the death of the King of my heart."
One woman said "I came tonight and I will do it in the next few days. For King Michael, especially for Michael. For the example that remains to us, the Romanian people."
King Simeon of the Bulgarians, accompanied by Crown Princess Margarita and her husband, Prince Radu, came to the palace to pay his respects to the late king.
People have placed candles, flowers and messages outside the palace.