Swiss artist Thomas Hirschhorn's latest project - taking Andy Warhol's art to the public - is on track to launch tomorrow.

That is when he will unveil Warhol's 1986 screenprint of Marilyn Monroe on the platform of Madrid's Atocha-Almudena Grandes train station.

He will be accompanied by Sandra Guimaraes, the director of the Museo Helga de Alvear in the Spanish city of Caceres where the work is part of the collection, before the pair take it on to the Gare do Oriente station in Lisbon on Thursday.

They came up with the idea after Guimares gave Hirschhorn "carte blanche" to celebrate the museum's fifth anniversary. She said she wanted "to build a museum that is open to the world and without compartments".

The museum, which lies halfway between the two cities, was built to house the collection of gallery owner and philanthropist Helga de Alvear who died last year.

The number of people that can fit into San Francisco's smallest museum at any one time. Visitors need to make an appointment to enter the Commission Vault Museum in the city's Golden Gate Park which is in one room measuring six foot by 10 foot.

A now infamous photograph of disgraced British royal Andrew Mountbatten-Windsor was hung in the Louvre in Paris.

The image, taken by Reuters photographer Phil Noble as the former Prince left police custody following his arrest last week, was smuggled into the gallery by the campaign group Everyone Hates Elon. It has inspired hundreds of memes and social media posts since it was first published.

They posted a video on their Instagram site showing the picture being hung on a gallery wall yesterday where it stayed for 15 minutes before staff took it down.

Mountbatten-Windsor was arrested by UK police last week on suspicion of misconduct in public office, but has not faced charges. He has always rejected any wrongdoing in his associations with convicted sex offender Jeffrey Epstein and denied any personal gain from his role as trade envoy.

Paris artist JR has revealed more details about his monumental tribute to Christo and Jeanne-Claude 100 days ahead of its opening on the city's Pont Neuf bridge.

His installation, which will transform the bridge into a huge inflatable painted cavern from June 6 to 28, comes complete with a soundscape by musician Thomas Bangalter, best-known as one half of duo Daft Punk.

It will also use virtual reality technology to bring the interior alive for visitors to the installation which will be free to visit and open 24 hours a day.

JR, whose idea was inspired by the quarries where the stones used to build the bridge came from, said he wanted to make sure the work has "a second life" after it comes down "whether it is kept for potential exhibitions, its materials are reused to create other inflatable structures, or it is completely recycled by the textile industry".

More than three million people visited the bridge in 1985 over the fortnight when Christo and Jeanne-Claude wrapped it in fabric for one of their trademark installations.

1 - More than 100 people took part in a sit-down protest in a gallery dedicated to Richard Serra at the Reina Sofia Museum in Madrid demanding a cut in the 21% tax rate levied on art sales by the Spanish government. They sat around the replica of his work Equal-Parallel/Guernica-Bengasi which Serra made after the museum admitted it had lost the original after placing it in storage.

2 - Winter weather has played havoc with New York's museums with the Guggenheim, the Museum of Modern Art and The Met all closed today. The storm is expected to bring heavy snowfall and freezing temperatures to the city with mayor Zohran Mamdani saying it has "not faced a storm of this scale in the last decade".

3 - Tributes have been paid to art dealer Ashley Stewart Rodder after her death aged 42 following a long illness. A director at Gagosian, she previously worked at Salon 94 and David Zwirner championing the work of artists including Nathaniel Mary Quinn.

4 - The Museum of Chinese in Australia is due to open to the public tomorrow. The project to open the building, in Sydney's Chinatown, has taken seven years since it was first proposed.