In this photograph, President George W. Bush and First Lady Laura Welch Bush participate in a wreath-laying ceremony near the crash site for United Airlines Flight 93 in Somerset County, Pennsylvania, on the first anniversary of the terrorist attacks against the United States on September 11, 2001. Flight 93 was one of four airplanes hijacked by al-Qaida terrorists on September 11, 2001. Believed to be targeting the United States Capitol Building, the flight crashed into a field after passengers and crew attempted to regain control of the aircraft. Preliminary work for the Flight 93 National Memorial was completed on September 10, 2010, and the permanent memorial opened to the public on September 10, 2015. In 2002, President Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

In this photograph, President Barack Obama and First Lady Michelle Obama visit the crash site for United Airlines Flight 93 following a ceremony at the Flight 93 National Memorial in Somerset County, Pennsylvania, on the tenth anniversary of the terrorist attacks against the United States on September 11, 2001. Flight 93 was one of four airplanes hijacked by al-Qaida terrorists on September 11, 2001. Believed to be targeting the United States Capitol Building, the flight crashed into a field after passengers and crew attempted to regain control of the aircraft. Preliminary work for the Flight 93 National Memorial was completed on September 10, 2010, and the permanent memorial opened to the public on September 10, 2015. In 2002, President George W. Bush designated September 11th as Patriot Day, a time that has been recognized through presidential proclamations as a national day of remembrance, prayer, and service. Presidents and first ladies typically commemorate the day through moment of silence observations on the White House South Lawn, and by attending remembrance ceremonies at sites affected by the terrorist attacks.

This painting of the signing of the Declaration of Independence on July 4, 1776 is by artist Charles-Edouard Armand-Dumaresq. Also in the White House Collection is a sketch that may be a draft by the artist for this work. The painting depicts the delegates actively debating and voting on the Declaration. Armand-Dumaresq was a French painter who visited the United States in the 1870s.

This painting by Daniel Garber depicts a landscape on the banks of the Delaware River in Byram, New Jersey and is an example of Garber's mature art. Garber was an American Impressionist painter and member of the New Hope School.

This watercolor by Gustav Ketterer is of the Liberty Bell in the foyer of Independence Hall in Philadelphia, Pennsylvania. Ketterer's style is detailed and realistic, with the famous bell on display on the ground level of the hall, surrounded by a stairwell and balcony.

This is an 1861 engraving by Alexander Hay Ritchie, or A. H. Ritchie, of the painting Lady Washington's Reception by Daniel Huntington. First Lady Martha Washington hosts a reception at the President's House in Philadelphia for distinguished guests. Ritchie was a well known engraver of mezzotints featuring historical or allegorical subjects.

This painting of Independence Hall in Philadelphia, Pennsylvania is by Danish-born Joachim Ferdinand Richardt (often referred to as Ferdinand Richardt). The landscape that unfolds outside the hall captures the hustle and bustle of everyday summer life at the intersection of Sixth and Chestnut Streets. Richardt, who emigrated to the United States as an adult, was known for his attention to detail, evident in the activity at the intersection.

This landscape by Nicolino Calyo looks down upon the Fairmount Waterworks in Philadelphia, Pennsylvania from atop a high hill. A long stairwell with visitors walking on it climbs down the hill towards the Fairmount Waterworks buildings that line the shore of the Schuylkill River. Calyo was a gifted landscape painter who was born in Italy but left in the early 1820s and immigrated to the United States in 1834. He has two paintings in the White House Collection.

This drawing of the signing of the Declaration of Independence on July 4, 1776 is by artist Charles-Edouard Armand-Dumaresq. The drawing is possibly a sketch or draft of Armand-Dumaresq's oil painting that is also in the White House Collection. The drawing depicts the delegates actively debating and voting on the Declaration. Armand-Dumaresq was a French painter who visited the United States in the 1870s.

This painting by Nicolino Calyo shows the rear of the Merchant's Exchange Building in the Old City neighborhood of Philadelphia, Pennsylvania. In addition to the building, the scene contains multiple small, fascinating details of the street in front of the building, including three horses caught in mid-gallop rounding a bend and two dogs chasing one another. Calyo was a gifted landscape painter who was born in Italy but left in the early 1820s and immigrated to the United States in 1834. He has two paintings in the White House Collection.

This map of Virginia and Maryland was originally created by Joshua Fry and Peter Jefferson, father of Thomas Jefferson, and published by French map maker Robert de Vaugondy. In addition to the colonies of Virginia and Maryland, the map shows parts of Pennsylvania, New Jersey, and Delaware. To the west beyond the Allegheny Mountains lies the French territory of Louisiana, which at the time encompassed much of the western and northern portions of the North American continent.