Curators call on St Petersburg prosecutor to investigate "criminal expropriation" of the artefact

How the New York museum is leading the way in conserving half a millennium of style

Two years of investigation preceded the Philadelphia Museum of Art’s exhibition of highlights from the Johnson Collection

Figure found using X-ray photography during research by National Galleries of Scotland and Courtauld Institute of Art

Mellon Foundation grant helps to establish conservation centre at city’s Asian art museum

Portrait by Thomas Couture belonged to a French politician who opposed the Nazis

Monarch’s ceremonial bed has survived many battles

The £30m fund helps locals to safeguard and promote heritage at risk in 12 countries in the Middle East and Africa

New research by the National Gallery of Art looks into the complex question of what constituted a finished work in the eyes of the artist

Cultural locations in the Caribbean, the US Gulf coast and Mexico hit by recent hurricanes and earthquakes were a last minute addition to the list

A surprise find in the Bronx is now part of an exhibition on Baroque painter Cristóbal de Villalpando

“New symbol of Russia” created by New York’s High Line architects is accused of being “catastrophically” out of place

The painting has rarely gone off display at the museum since its opening in 1928—until now

Study of Latin American works from the Coleccíon Patricia Phelps de Cisneros reveals orientation shifts, household paint and ways to obtain that perfect edge

Latest commission at the Headlands Center for the Arts continues long tradition of rehabilitation projects at the former military complex

Altarpiece taken from Italian church in 2014 and rolled up inside a carpet lost 30% of surface paint

US Interior Secretary hinted at downsizing after visiting two of Nevada’s national monuments, as part of review ordered by President Trump

The French billionaire plans to open a museum in the Bourse de Commerce in 2019

Façade restoration nears completion in project to unite the RA campus in time for 250th anniversary in 2018

From surfboards to a Second World War bomber, new show charts the rise of the humble material

Australian-born painter's workspace temporarily opens this summer for his centenary

Site in Turkey is due to be flooded after completion of giant Ilisu Dam

Sea Music (1991) on Dorset's Poole Quay refreshed after 25 years' exposure to salty sea air and detritus from barges being loaded

Focus will be on restoring the theatre’s machinery, the upper levels of the salons and the podium that houses one of France’s most important stage sets

Conservator travelled to Jordan to treat her work ahead of major Tate Modern show opening this week

Thomas Wilfred’s 50-page manual came in handy

Gemeentemuseum has been assessing works since 2009 as part of its Mondrian Restoration Project

The French Impressionist’s former summer residence in Essoyes opens to the public in June after a major overhaul of its gardens and fin-de-siècle interiors

A century of grime was removed from the teaching tools ahead of the show

The installation is secured to the ceiling via 1,500 Perspex discs filled with a state-of-the-art adhesive