Three presidents who embarked on remarkable adventures after they left office

President Joe Biden may enjoy a quiet retirement, unlike some of his predecessors, who enjoyed an active political career after leaving the Oval Office .

Herbert Hoover led international relief efforts for the U.S. during and after World Wars I and II .

Gerald Ford was one of the only presidents to flirt with a political comeback after leaving office.

Jimmy Carter gained national attention in the 1990s when he publicly negotiated foreign policy with North Korean dictator Kim Il Sung .

Jimmy Carter became unusually politically active during his post-White House years , particularly garnering attention for repeated conflicts with the Clinton administration.

In 2006 , Carter made waves for publicly questioning the results of the Camp David meeting in a book he published that year .

14 members of the Carter Center , an advisory board with the former president’s human rights organization, resigned over the book.

Carter later apologized over one sentence in the book that seemed to justify terrorism against Israel .

Despite his foreign policy gaffes, Carter 's decades of humanitarian work helped earn him a warm place in people's hearts.