What happens when the US president comes to visit Ireland?

...and what happens when it’s all over — how have towns that welcomed presidents of the past dealt with what is left behind?

Clockwise: Former US presidents John F. Kennedy, Ronald Reagan, and Barack Obama on visits to Ireland over the years; current US president Joe Biden, who's the next White House occupant to visit the country next week.

When President Joe Biden touches down in Ireland next week, he will be the latest in a string of US leaders to visit the old sod. 

Here to celebrate 25 years of relative peace in Northern Ireland, Biden is expected to take time out to visit ancestral homes and landmarks in both Mayo and Louth, thus following in a tradition started by the first Irish-American president, John F. Kennedy.