Just a few miles west of the city center, Fondation Vasarely is a museum housed in its own masterpiece (16 interconnected hexagons) filled with Victor Vasarely's optical art. This Hungarian-born French artist is known as the father of this style — a method that combines graphic art with optical illusion, often playing with patterns, lines, shadows and light. The vibrant and colorful art installations captivate both adults and children alike. At the foundation, you can experience much of his work in the Tapestries, Kinetic and Planetary Folklore rooms.

"The building is very striking and a precise echo of its contents," said one TripAdvisor user. "The grand works inside deserve to be absorbed with a good long sit on the sofas."

To get here, you can take bus line 2 from Rotonde Poste to the Fondation Vasarely stop. The museum is open Tuesday to Sunday from 10 a.m. to 1 p.m. and 2 to 6 p.m., and admission costs €9 EUR (about $12 USD) for adults and discounted admission is available for children, groups and disabled visitors. For more information, visit the Vasarely Foundation's website.