The Trundholm Sun Chariot (Nordic Bronze Age, c. 1400 BC). Artifact is in the public domain. Reproduction photograph © National Museum of Denmark, licensed under CC BY-SA 3.0. Source: Wikimedia Commons.

Washington Crossing the Delaware (1851) by Emanuel Leutze (1816–1868). Metropolitan Museum of Art, New York. Public domain. Source: Wikimedia Commons (Metropolitan Museum of Art).

Interior of the Pantheon, Rome (c. 1734) by Giovanni Paolo Panini (1691–1765). National Gallery of Art, Washington. Public domain. Source: Wikimedia Commons (National Gallery of Art, open access).

Sitges Train Station (1882) by Joan Roig i Soler (1852–1909). Oil on wood, Col·lecció Art de la Vila de Sitges. Digitized by the Google Art Project. Public domain, via Wikimedia Commons.

Sunrise, Yosemite Valley (c. 1870) by Albert Bierstadt (1830–1902). Amon Carter Museum of American Art, Fort Worth. Public domain. Source: Wikimedia Commons.

View of Warsaw from the Terrace of the Royal Castle (1773) by Bernardo Bellotto (1721–1780). National Museum in Warsaw. Public domain. Source: Wikimedia Commons (digitized via Google Art Project).

View from Stalheim (1842) by Johan Christian Dahl (1788–1857). Artwork is in the public domain (artist died 1857). Reproduction image courtesy of the National Museum of Art, Architecture and Design, Oslo. Photo: Børre Høstland, Jacques Lathion / the National Museum. Licensed under CC BY 4.0. Source: Nasjonalmuseet.