After a spate of people jumping over the fence at the White House, work began this month to make the fence tougher, including new spiky tops. The improvements are temporary until a long-term solution is found, with a design expected later this summer and construction to begin in 2016. The need to keep people out - and maybe livestock in - is hardly new. Ever since Thomas Jefferson in 1801, the White House has been changing the fence.
Here's a look at the history with information provided by the White House Historical Association.
c. 1801
Courtesy of the Library of Congress
Etching of the White House, Dec. 8, 1833, with early version of the fence visible from the north side.
Thomas Jefferson installed a post-and-rail fence around the White House. At one end of the South Lawn, he erected an eight-foot wall with a sunken ditch to keep livestock from grazing in the garden.