Scans reveal the Florida institution's portrait of Philip IV had a fashion-forward makeover

Leiden Collection due to open at the Louvre next year before travelling to Shanghai, Beijing and Abu Dhabi through 2018

Museum invites 24 artists to exchange images through their phones “in a game of visual ping-pong”

Keir collection of 2,000 works is one of the world's largest

The series of 15 never-before-shown works have remained in the artist’s Maine studio since he started them in 2006, four years before his death

The US artist Jill Magid on making art about bureaucracy

As waters rise, Miami is on the front line of global warming

Artist’s refuge in tiny Captiva has been transformed into a retreat

Papo Colo will live off the land in silence for 400 days as part of a new performance

First reactions to property tycoon’s election to the White House and what it could mean for the arts

Annette Lemieux asked the museum’s curators to reverse her work Left Right Left Right

Los Angeles-based billionaire makes surprise $42.5m gift to fund expansion

Collectors’ gift is part of wider trend in US museums as they redefine American art

Explore art history with Kerry James Marshall and bask in the pure positivity of Mark Leceky

The Venezeulan collectors have given more than 100 works to the New York museum ahead of expansion

Curators have yet to examine more than 300 of late artist’s paintings

Photographs of works made by artists using decommissioned weapons are displayed in Senate building one month before the election, while originals are on view at local think tank

From a man cave to a coral reef, we've got you covered

The collection of Everett Fahy, who led the museum’s European paintings department and later the Frick Collection, headlines Christie's Old Master sale

American and Chinese museum leaders gather in New York to discuss international co-operation

Roni Horn gets the solo treatment ahead of private museum’s major expansion in 2018

Tens of thousands expected at the weekend festival celebrating the newest addition on the National Mall, including performances by the Roots and Public Enemy, dance, spoken word and a southern BBQ

Boundaries are not what they used to be, as the former director of the Andy Warhol Museum heads to Sotheby’s

US president Barack Obama is due to cut the ribbon on the Smithsonian’s newest museum this month

Construction on the landmark Art Deco building pushed back until spring 2017

British sculptor invited to create mud-based work in Donald Judd’s restored SoHo home and studio

Part of the New Portraits series, the work at the centre of the case was shown—and sold—at Frieze New York last year

From the rigours of fashion at the Met to the power of sport in Brooklyn