The Centre Pompidou in Paris embodies early 20th-century modernity, housing Europe's largest collection of modern and contemporary art. Featuring works by Duchamp, Mondrian, Delaunay, and Klein, the museum's unique exterior of pipes and wires contrasts with its rich cultural treasures inside. Three museum guards offer a personal tour of this iconic institution.

The Uffizi in Florence draws up to 10,000 visitors daily, but only staff can access areas behind the exhibition halls. Three museum guards share their favorite artworks, including forgotten 18th-century star Rosalba Carriera in a high-security depot. They also reveal the Medici Venus in the Tribuna, an exclusive area off-limits to the public.

The Prado in Madrid is at the top of the international art museums with the world's most extensive collection of works by Goya and Velázquez. Three museum guards show us their favorite pictures, which are often overlooked - like the guards themselves. They have a lot of detailed knowledge about the works of art that once belonged to the royal collection of the Spanish rulers.

The Wallraf-Richartz Museum in Cologne boasts a renowned collection of medieval art, highlighted by the famous "Madonna of the Rose Bower". It also features works by Rubens and German Impressionists. The museum's foundation stems from Ferdinand Franz Wallraf's efforts during the Napoleonic occupation, when art from churches, repurposed for military use, was discarded on the streets.