Museum-goers left their shirts, trousers and underwear - everything except their shoes and socks - for a special showing at a museum in Austria.
The occasion at Vienna's Leopold Museum was a special after-hours showing of Nude Men from 1800 to Today - an exhibit of 300 paintings, photographs, drawings and sculptures focused on the bare male.
For many, the evening was a goosebump-raising instance of life imitating art.
"I can't say I'm sweating," said office worker Herbert Korvas, as he stood in the atrium with other young men wearing no more than socks and a smile and waiting for the tour to start.
He said he was drawn to the idea of naked museum viewing "because it was something different".