James Madison —
Photo Credit: By John Vanderlyn - Ths White House Historical Association. the painting is in the White House collection[1], Public Domain, https://commons.wikimedia.org/w/index.php?curid=73110465

Location of Louisiana Purchase — Louisiana Purchase overlaid on present USA
Photo Credit: By William Morris - Not published online. Sent directly to me for uploading on author's behalf., CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=42826877

President's House (north front), Washington — In 1790, Congress set the site of the national capital along the Potomac River. John Adams moved into the White House on November 1, and First Lady Abigail Adams arrived a few weeks later.
Photo Credit: By Unknown Artist – Artist (American) - 9QF4iKPZNCvPQQ at Google Cultural Institute maximum zoom level, Public Domain, https://commons.wikimedia.org/w/index.php?curid=21871386

President's House, Philadelphia — Residence of Washington in High Street. Adams occupied this Philadelphia mansion from March 1797 to May 1800
Photo Credit: By William L. Breton, artist and lithographer (c.1773–1855) - John Fanning Watson, Annals of Philadelphia (1830), opp. p. 361., Public Domain, https://commons.wikimedia.org/w/index.php?curid=9517553

Adams' birthplace — Birthplace of U. S. President John Adams, in Quincy, Massachusetts: Part of the Adams National Historical Park.
Photo Credit: By Daderot, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2438038

John Adams — c. 1800/1815, oil on canvas
Photo Credit: By Gilbert Stuart - National Gallery of Art, Washington, Public Domain, https://commons.wikimedia.org/w/index.php?curid=52673612

George Washington — cropped
Photo Credit: By Gilbert Stuart - http://www.clarkart.edu/Collection/7577, Public Domain, https://commons.wikimedia.org/w/index.php?curid=591229

Underneath Niagara Falls — by Richardt at the Met, 1862
Photo Credit: By Metropolitan Museum of Art - http://images.metmuseum.org/CRDImages/ap/web-large/APS6828.jpg, CC0, https://commons.wikimedia.org/w/index.php?curid=56190025

Niagara Falls (circa 1832) — Niagara Fälle. Les chûtes du Niagara. By Karl Bodmer - http://www.gallery.oldbookart.com/main.php?g2_itemId=30172, from the book "Maximilian, Prince of Wied’s Travels in the Interior of North America, during the years 1832–1834"
Photo Credit: Publisher: Ackermann & Co., 1839, Public Domain, https://commons.wikimedia.org/w/index.php?curid=38943436

Niagara — 1857 painting
Photo Credit: By Frederic Edwin Church - Web Gallery of Art: Image Info about artworkThe Bridgeman Art Library, Object 445386#National Gallery of Art, Washington, D. C., online collection, Public Domain, https://commons.wikimedia.org/w/index.php?curid=15452398

The assassination of William Morgan — As imagined and engraved by artist Pierre Méjanel in1886
Photo Credit: By Gravure dessinée par Pierre Méjanel et gravée par François Pannemaker. - Léo Taxil, Les Mystères de la Franc-Maçonnerie, Paris, 1886., Public Domain, https://commons.wikimedia.org/w/index.php?curid=33281486