US first lady Michelle Obama and her daughters today went on a private guided tour of Glendalough in the Wicklow Mountains National Park.
Mrs Obama and Malia and Sasha were shown the 6th century monastic site of Glendalough.
The president's youngest daughter, 12-year-old Sasha, batted swarming midges away from her face as the trio learned about the legendary Deer Stone.
The Obamas were told the tale of a wild doe appearing before St Kevin, founder of the monastery, who milked it and fed two orphan babies from the hollowed-out stone.
They were shown around the monastic ruins in the heart of the glacial valley and walked around the round tower.
Sasha was given the honour of closing the door to the ruins of St Kevin's Church, which dates back 1,500 years.
The teen was handed a key and locked the door, before turning to her older sister and giving her a high five.
The Obamas later had lunch in Finnegan's Pub in Dalkey, with U2's Bono and his wife Ali Hewson among those attending.
On the menu was smoked bacon and cabbage, cottage pie, salmon and chicken and ham with mozzarella.
Chef Pat Finnegan said that "everyone went for fish" and guests had a choice of strawberries and cream, warm fudge cake and apple crumble for dessert.
Around 60 people attended the private lunch, including a number of local residents, with hundreds of people outside waiting to catch a glimpse of the US First Family.
Yesterday, Mrs Obama and her daughters spent the day in Dublin visiting Trinity College and attending a performance of Riverdance at the Gaiety Theatre, where she addressed a group of children.
The family followed the show with dinner at a seafood restaurant on Lower Pembroke Street in Dublin city centre.
The First Lady took time to greet well-wishers as she left with the two girls just before 9pm.