It came after a week of remembrance in both Texas and Washington.
The public viewing will kick off four days of events in memory of the 41st US president.
Former US President George HW Bush has been discharged from hospital after receiving treatment for pneumonia.
A statement said he is "thankful for the many prayers and kind messages" he received while at Houston Methodist Hospital.
The statement also paid tribute to the "world-class care that both his doctors and nurses provided".
Bush, 92, was admitted into intensive care earlier this month and a few days later his wife Barbara, 91, was admitted for bronchitis. She was released last week.
Mrs Bush was hospitalised after experiencing fatigue and coughing and was admitted just days after her husband George H.W. Bush.
Former US President George H.W. Bush is in intensive care after suffering from pneumonia, as his wife is admitted as a precaution.