The Swimming Cities of Serenissima on the Adriatic Sea. On view in Swoon: Submerged Motherlands, at the Brooklyn Museum of Art. Opens Friday. (Photo by Tod Seelie.)

• Beijing: Art Post-Internet, at the Ullens Center for Contemporary Art. Through May 5, in the Chaoyang District.
• L.A.: Freeway Studies, at Ben Maltz Gallery. Opens Saturday, at Otis College of Art and Design, in Westchester.
• L.A.: The Snowy Day and the Art of Ezra Jack Keats, at the Skirball Cultural Center. Opens today, in Bel Air.
• L.A.: Heaven and Earth: Art of Byzantium from the Greek Collections, at the Getty Villa. Through August 25, in Malibu.
• L.A.: Elliott Hundley, at Regen Projects. Opens Saturday, in Hollywood.
• Orange County, Calif.: Sarkisian & Sarkisian, at the Orange County Museum of Art. Opens Sunday, in Newport Beach.
• Tijuana: Paisaje Urban de un Presente Bizarro, with Corrie Slawson & Marc Lefkowitz, Hugo Crosthwaite, Luis G. Hernandez and Pepe Mogt, at TJ IN CHINA Project Room. Opens Friday at 6pm, in Zona Centro.
• Chicago: Isa Genzken: Retrospective, at the Museum of Contemporary Art Chicago. Opens Saturday.
• Miami: Alexander Kroll, The Sky on the Flor, at Fredric Snitzer. Opens today, in the Wynwood District.
• NYC: Masterpieces and Curiosities: Diane Arbus’s Jewish Giant, at the Jewish Museum. Opens Friday, on the Upper East Side.
• NYC: Now You See It: Photography and Concealment, at the Metropolitan Museum of Art. Through September 1, on the Upper East Side.
• NYC: I Scarcely Have the Right to Use This Ghostly Verb, at the Sheila Johnson Design Center. Through April 16, at Parson the New School of Design.
• NYC: Malick Sidibé, at Jack Shainman Gallery. Through April 26, in Chelsea.
• NYC: Thank You, the final show at Dodge Gallery. Opens today, on the Lower East Side.
• NYC: The Heroic Object, at Parallel Art Space. Through May 11, in Ridgewood.