The Mather Brown Portraits of Thomas Jefferson and John Adams 

Two paintings, two Founders, one (tested-by-politics) friendship.
In 1788, when he was visiting England from France, Jefferson renewed his friendship with John and Abigail Adams and sat for a portrait by the American expatriate painter Mather Brown. Jefferson hung a copy of that portrait along with one of John Adams, also by Brown, at Monticello. It's like an 18th-century BFF locket. Only better.