Two decades of grime were removed from The Ecstasy of St Teresa (1647-52)

Historic furnishings damaged and around a dozen objects missing or destroyed

Survey to identify the most endangered sections will begin in Inner Mongolia

Project reveals madness of King George III for his map collection <p> </p>

Despite earlier threats to withdraw vital European funding, officials are expected to extend deadline to finance work in 2016 and 2017

Project to mark 500th anniversary of artist’s death upgrades Infernal Landscape to an authentic work

House on 500 Capp Street in San Francisco will become an arts space, archive and study centre

With the country in “chaos” because of civil war, museum council warns officials, institutions and the art trade of the kinds of objects that could be looted

Chinese city is first in Asia to host global congress

The Art Preservation Index wants collectors to know that much art today is made from materials that will deteriorate fast

Bonnie Burnham made the organisation, which turns 50 this year, into a global powerhouse

Cleaning and LED lighting give visitors a glimpse of how the space originally looked

Artist’s grandsons waived fees to conserve his largest work, which goes on show at Tate Modern this week

International Festival of Film Preservation, which opens today, will show a mix of silent comedies, classics and cult favourites

The Fendi-backed €2.2m restoration of the Roman tourist favourite is nearly complete

Archaeologist says climate change could result in more ancient objects resurfacing in the far North

CT scans reveal secrets of Field Museum’s Peruvian and Egyptian treasures before they are sent on the road

€2m restoration of eight marble outer walls took 21 months

Project aims to create virtual archives using 3D scanning technology

Rediscovered Japanese panels on show after two years of painstaking restoration in specialist studio