In lockdown due to the coronavirus pandemic? Closed museums offer art lovers virtual opportunities to explore works from among the world\u0027s leading collections online. Here\u0027s a look.Exhibitions onlineWith the National Gallery of Art in Washington, D.C., closed, visitors at home can take in the beauty of the outdoors with its stunning online exhibition, "True to Nature: Open-Air Painting in Europe 1780-1870," featuring works by Coignet, Constable, Giroux and others; and the NGA\u0027s exploration of Edgar Degas\u0027 works depicting the Paris Op\u00c3\u00a9ra. Images from the Smithsonian Museum of American Art\u0027s current exhibition, "Hearts of Our People: Native Women Artists," can be viewed online, along with audio commentary of selected works and video interviews of artists.Explore Diego Rivera\u0027s murals in the Detroit Institute of Arts\u0027 online exhibit, "Diego Rivera\u0027s Detroit Industry."At the website of New York City\u0027s\u00a0Whitney Museum, the online exhibition "Vida Americana: Mexican Muralists Remake American Art, 1925\u00e2\u0080\u00931945" features companion videos, essays, audio guides and installation photography.Large-scale installations of sculptures and mixed-media pieces are featured with commentary on the website of the Dia Art Foundation, including works by Andy Warhol, Gerhard Richter and Louise Bourgeois.On the MASS MoCA website, the immersive exhibit "James Turrell: Into the Light" may lose a bit on a laptop, but set it to full screen, and immerse yourself in its enveloping colored light. Virtual museum toursThe website of the Louvre Museum in Paris offers visitors a chance to stroll its galleries virtually, including its Egyptian antiquities.London\u0027s National Gallery offers a virtual 360\u00c2\u00b0 tour of rooms. Likewise, Google Street View takes you right inside the J. Paul Getty Museum in Los Angeles.Google Arts & Culture offers virtual tours of many world museums, as well as the non-museum Chauvet Cave, which displays 36,000-year-old paintings.Art HistoryThe Guggenheim Museum in New York has released scores of PDFs of catalogues and art history books, from retrospectives of Klee, Rauschenberg, Kandinsky, Calder, Rothko and Mir\u00c3\u00b3, to treatises on surrealism, the structure of modern painting, and the art of the motorcycle, available for free on the Internet Archive. The Museum of Modern Art has on its website images from every exhibition held at the museum since its founding in 1929. The Rijks Studio features in-depth analysis of works in the collection of the Rijksmuseum in Amsterdam, including paintings by Rembrandt and Vermeer.LecturesThe Museum of Fine Arts, Boston\u00a0has on its YouTube channel a series of lectures and panel discussions featuring curators, conservators, authors and critics, on such topics as the Dutch Golden Age, Impressionism, female artists, and Hollywood films produced during the Red Scare.The Barnes Foundation in Philadelphia offers daily video art talks on major pieces in its collection.The P\u00c3\u00a9rez Art Museum Miami offers videos of art talks.DemonstrationsThe YouTube channel of the Corning Museum of Glass, in Corning, New York, offers videos of glass-blowers creating beautiful works of art.Artist Kong Pak-yu demonstrates brushpainting on the site of San Francisco\u0027s Asian Art Museum.The Seattle Art Museum has launched "Stay Home With SAM," sharing education lessons and storytime suggestions for children, as well as art-making activities.PhotographyThe Portland Art Museum in Portland, Oregon, has several online exhibitions, including one featuring the evocative documentary-style images of photographer Victor Jorgensen (an acolyte of Edward Steichen\u0027s), who served with the Naval Aviation Photographic Unit during World War II. "Vanity Fair: Hollywood Calling" is the Annenberg Space for Photography in Los Angeles\u0027 retrospective of the magazine\u0027s celebrity photos, with audio annotation by exhibit curator and Vanity Fair creative development editor David Friend. "Out of the Shadows: Contemporary Chinese Photography" is an online offering from the tantalizing exhibition at the Museum of Photographic Arts in San Diego.Virtual experiencesOne of the premier art collections in the world, the British Museum in London makes its historical and artistic artifacts \u00e2\u0080\u0094 from the Rosetta Stone to the Elgin Marbles\u00a0\u00e2\u0080\u0094 accessible online. You can also trace a timeline of historical and cultural holdings and their place in mankind\u0027s development through the millennia with their "Museum of the World" project (a partnership with Google Cultural Institute).The Van Gogh Museum in Amsterdam is extending its education about the life and work of the Dutch painter online, including study lessons for students. Visitors can also read his biography and letters, and view hundreds of works by the artist and his contemporaries.Google\u0027s online gallery of the Mus\u00c3\u00a9e d\u0027Orsay offers a history of the Paris museum\u0027s origins as a train station. The Metropolitan Museum of Art in New York offers in-depth looks at its collected works, conservatorship and children\u0027s programs. The museum also features "82nd & Fifth," in which curators discuss a single work of art that, they say, changed the world. And while this year\u0027s Met Gala has been postponed, you can watch videos from the Costume Institute\u0027s past exhibitions, from "Heavenly Bodies: Fashion and the Catholic Imagination," and "Manus x Machina: Fashion in an Age of Technology," to "Alexander McQueen: Savage Beauty.""The Kimbell at Home" showcases the collection of the Kimbell Art Museum in Fort Worth, Texas, with virtual tours, audio commentaries, video lectures and children\u0027s activities.\u00a0 SerendipityWhile you\u0027re not able to physically stroll through galleries for the foreseeable future, many museum websites allow you to stroll through their databases; type in an artist\u0027s name, and scores of images \u00e2\u0080\u0094 some unfamiliar, some iconic \u00e2\u0080\u0094 will come up. Or, wander virtually through their collections and discover remarkable treasures. Among the collections to be explored are:Amon Carter Museum of American Art\u00a0in Fort WorthArt Institute of ChicagoAsheville Art Museum, Asheville, North CarolinaBaltimore Museum of ArtThe Broad\u00a0in Los AngelesCleveland Museum of ArtDallas Museum of Artde Young Museum, San FranciscoDenver Art MuseumThe Frick Collection, New YorkGeorgia O\u0027Keeffe Museum\u00a0in Santa Fe, New MexicoIsabella Stewart Gardner Museum in BostonLos Angeles County Museum of ArtMuseum of Contemporary Art in ChicagoMuseum of Fine Arts, HoustonPhiladelphia Museum of ArtSaint Louis Art MuseumSanta Barbara Museum of ArtUffizi\u00a0in Florence, ItalyWalker Art Center, MinneapolisAnd as always, be sure to exit through the gift shop.