At President Abraham Lincoln's funeral in 1865, the oak tree stood just a few feet from the event, shading the funeral choir.
The president of Brazil held an emergency cabinet meeting today to deal with a wave of protests across the country in the last week.
Yesterday more than a million people took part in demonstrations in nearly 100 cities.
The protests started over an increase in transit fares but are now aimed at corruption.
Meanwhile, protests also continue in Turkey.
The BBC’s Katya Adler reports from Istanbul.
Peter O’Dowd follows the route of Abraham Lincoln's funeral train 150 years ago, to look at modern-day race relations and Lincoln's legacy.