Claim to Fame: Part of this painting -- the skyward-looking putti, or cherubs -- has appeared on everything from posters to postcards, sometimes naughtily dangling cigarettes. They're just a smidge of the original, which features a cloud-supported Mary, Baby Jesus and saints Sixtus and Barbara.
Info: About $8. 011-49-35-14-91-4679, www.skd-dresden.de/en.

(Detail of "Guernica" by Pablo Picasso - Museo Nacional Centro de Arte Reina Sofia)
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What: Rene Magritte's "Empire of Lights"
Where: Brussels, at the Museum of Modern Art
Claim to Fame: Surrealist duality from the man who brought us floating bowler hats and the pipe that wasn't. Clouds float in a daytime sky over a dark scene illuminated by a lamppost. This version of the oft-painted work is supposedly the most complete.
Info: About $7. 011-32-25-08-3211, www.fine-arts-museum.be.
What: Caravaggio's "Beheading of St. John"
Where: Valletta, Malta, at St. John's Cathedral
Claim to Fame: This massive, moody work serves as an altarpiece -- many say it's the artist's masterwork -- for the Knights of St. John headquarters. Caravaggio's signature is in the red tide streaming from John's neck.
Info: About $3. 011-35-6-21-22-0536, www.visitmalta.com.