Landscapes, these by French artist Pierre-Henri de Valenciennes. Living from 1750 to 1819, he helped to elevate the status of open-air painting.

Pierre-Henri_de_Valenciennes_-_View_of_the_Convent_of_Ara_Coeli_with_Pines_-_WGA242274
Il Convento dell’Ara Coeli” (View of the Convent of Ara Coeli with Pines). 1780. Oil on paper mounted on board. Collection of the Louvre, Paris. In the public domain in the United States because the artist died over 70 years ago. via https://commons.wikimedia.org/wiki/File:Pierre-Henri_de_Valenciennes_-_View_of_the_Convent_of_Ara_Coeli_with_Pines_-_WGA24227.jpg
"Cow-Shed and Houses on the Palatine Hill." ca. 1782-1784.
“Cow-Shed and Houses on the Palatine Hill.” ca. 1782-1784. Oil on paper laid on canvas. Copyright The Gere Collection, on long-term loan to the National Gallery, © Private collection 2000. Fair use license. via https://www.nationalgallery.org.uk/paintings/pierre-henri-de-valenciennes-cow-shed-and-houses-on-the-palatine-hill
"The Banks of the Rance, Brittany." Possibly painted in 1785.
“The Banks of the Rance, Brittany.” Possibly painted in 1785.Oil on paper, laid down on canvas. Collection of the Metropolitan Museum of Art, New York. In the public domain due to age. via https://www.metmuseum.org/art/collection/search/438677
Italian Landscape.
Italian Landscape. No date. Oil on canvas. Image ©2020 Fine Arts Museums of San Francisco. Fair use license. via https://art.famsf.org/pierre-henri-de-valenciennes/italian-landscape-1985101

Down by the water just a bit back. Italian. Eugenio Bonivento, artist (1880-1956). Studied at the Academy of Fine Arts of Venice and mostly painted Venetian scenes.

"Zattere a Venezia."
“Zattere a Venezia.” No exact date. Oil on cardboard. Signed “E. Bonivento” on the bottom left. © Estate of the artist. Image © 2020 Sotheby’s. Fair use license. via https://www.sothebys.com/en/auctions/ecatalogue/2007/19th-century-paintings-and-sculpture-mi0276/lot.7.html
"Sailing boats near San Giorgio Maggiore, Venice.
“Sailing boats near San Giorgio Maggiore, Venice.” no date. Watercolor on paper. Signed “E. Bonivento” on the lower right. © Estate of the artist. Image © 2020 Dorotheum GmbH & Co KG. Fair use license. via https://www.dorotheum.com/en/l/6123459/#
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Untitled work. No date. © Estate of the artist. Image © Casa d’Aste Arcadia, Rome and Live Auctioneers. Fair use license. via https://www.liveauctioneers.com/item/76881826_zeno-eugenio-bonivento-chioggia-1880-milano-1956

Landscapes by American painter Marsden Hartley, (1877-1943).

1“Mount Katahdin (Maine), Autumn #2.” 1939.
“Mount Katahdin (Maine), Autumn #2.” 1939. Oil on canvas. Collection of the Metropolitan Museum of Art, New York. Image © 2020 The New York Times Company. Fair use license. via https://www.nytimes.com/2017/03/16/arts/design/marsden-hartleys-maine-his-muse-first-and-last.html
"Popocatepetl, Spirited Morning, Mexico." 1932.
“Popocatepetl, Spirited Morning, Mexico.” 1932. In the public domain in the United States because the artist died over 70 years ago. via https://fineartamerica.com/featured/popocatepetl-spirited-morning-mexico-1932-marsden-hartley.html?product=art-print
"The Wave." 1940.
“The Wave.” 1940. Oil on masonite-type hardboard. Collection of the Worcester Art Museum. Image © The Art Students League of New York. Fair use license. via https://www.asllinea.org/marsden-hartley-met-breuer/

Urban landscapes at least sort of sunken in gloom judging by the sky above. Louis Abel-Truchet, painter (1857-1918). Known for his portrayals of Parisian life around 1900, he also did engravings and etchings.

"Gare Saint Lazare." 1892. Oil on canvas. Signed "Abel-Truchet" and dated 1892 on the lower right.
“Gare Saint Lazare.” 1892. Oil on canvas. Signed “Abel-Truchet” and dated 1892 on the lower right. Image © 2020 GALLERY 19C. Fair use license. via https://www.gallery19c.com/artworks/9403/
"Vue du cimetière Saïd-Ahmed-el-Kébir à Blida."
“Vue du cimetière Saïd-Ahmed-el-Kébir à Blida.” No exact date. Oil on panel. Collection of the Musée des Beaux-Arts de Pau. Photo credit: Tylwyth Eldar. In the public domain in the United States because the artist died over 70 years ago. via https://commons.wikimedia.org/wiki/File:Louis_Abel-Truchet_-_Vue_du_cimeti%C3%A8re.jpg
"Les Bouquinistes." No exact date.
“Les Bouquinistes.” No exact date. Oil on panel. Signed “Abel Truchet” on the lower right. Image © Artcurial. Fair use license. via https://www.artcurial.com/en/lot-louis-abel-truchet-1857-1918-les-bouquinistes-huile-sur-panneau-2480-187
Fair, Paris. No exact date.
Fair, Paris. No exact date. Oil on cardboard. Image © Galerie Drylewicz, Paris. Fair use license. via https://galerie-drylewicz.com/artists/59-louis-abel-truchet/works/38-louis-abel-truchet-attribue-a-kermesse-paris/

Landscapes by artist Alfredo Müller who lived from 1869 to 1939. Swiss from a Franco-Italian background.

Alfredo-Muller-Landscape
Landscape. 1914. Image © wahooart.com. Artwork itself in the public domain due to age. via https://en.wahooart.com/@@/AQSUYD-Alfredo-M%C3%BCller-Landscape
"La Grande Cascade de Saint Cloud." 1905. Signed by the artist in pencil on the lower right and numbered "39" in pencil on the lower left. Title in pencil on the back. Published by Edmund Sagot, Paris, his dry stamp lower right below signature.
“La Grande Cascade de Saint Cloud.” 1905. Signed by the artist in pencil on the lower right and numbered “39” in pencil on the lower left. Title in pencil on the back. Published by Edmund Sagot, Paris, his dry stamp lower right below signature. Image © 1stdibs, Inc. 2020. Fair use license. via https://www.1stdibs.com/art/prints-works-on-paper/alfredo-muller-la-grande-cascade-de-saint-cloud/id-a_51859/?utm_source=pinterest&utm_medium=cpc
Alfredo-Muller-A-Rocky-Landscape
“A Rocky Landscape.” 1914. Image © WahooArt.com. Artwork itself in the public domain due to age. via https://en.wahooart.com/@@/AQSUYF-Alfredo-M%C3%BCller-A-Rocky-Landscape

Landscapes mostly of lakes and woods in Brandenburg from a world not too far away. German. Walter Leistikow, painter (1865-1908). Some of his early art was exhibited in 1886 at the Berliner Salon. Founder of the Berlin Secession movement.

"Grunewaldsee." 1895. Oil on canvas.
“Grunewaldsee.” 1895. Oil on canvas. Collection of the Alte Nationalgalerie, Berlin. In the public domain in the United States because it was published before January 1, 1925. via https://commons.wikimedia.org/wiki/File:Walter_Leistikow_-_Grunewaldsee_-_Google_Art_Project.jpg
"Abendstimmung am Schlachtensee." ca. 1895. Oil on canvas.
“Abendstimmung am Schlachtensee.” ca. 1895. Oil on canvas. Signed “W. Leistikow” on the bottom right. Collection of the Stiftung Stadtmuseum Berlin. In the public domain in the United States because it was published before January 1, 1925. via https://commons.wikimedia.org/wiki/File:Walter_Leistikow_-_Abendstimmung_am_Schlachtensee_(1895)_2.jpg
"Grunewaldsee oder Schlachtensee." 1900. Oil on canvas.
“Grunewaldsee oder Schlachtensee.” 1900. Oil on canvas. Photo credit: Martin Adam. Image © Bröhan-Museum Berlin. Cc0 License 4.0. via https://commons.wikimedia.org/wiki/File:Walter_Leistikow,_Grunewaldsee_oder_Schlachtensee,_um_1900,_Br%C3%B6han-Museum,_Foto_Martin_Adam.tif
River landscape. Painted by 1908.
River landscape. Painted by 1908. Oil on panel. Private collection. Image source: Dorotheum. In the public domain because the artist died over 70 years ago. via https://commons.wikimedia.org/wiki/File:Walter_Leistikow_-_River_Landscape.jpg

Otherworldly landscapes to make you feel very cold. William Degouve de Nuncques, painter. Living from 1867 to 1935 he was born in France but grew up in Belgium where he taught himself to paint.

"Rêve de Voyage." 1899.
“Rêve de Voyage.” 1899. In the public domain because the artist has been dead over 70 years. via https://laclefdescoeurs.tumblr.com/post/102563906712/r%C3%AAve-de-voyage-1899-william-degouve-de-nuncques
"La Grotte Du Drac, Manacor." No date.
“La Grotte Du Drac, Manacor.” No date. In the public domain because the artist has been dead over 70 years. via https://pixels.com/featured/william-degouve-de-nuncques-1867-1935-belgian-la-grotte-du-drac-manacor-william-degouve-de-nuncques.html
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“Storm on the North Coast.” No date. In the public domain because the artist has been dead over 70 years. via https://www.graphicine.com/william-degouve-de-nuncques/