Musee du Louvre
The collection runs from ancient Egypt and the classical world through medieval and Renaissance Europe to 19th-century painting. Its three defining treasures are the Mona Lisa, the Venus de Milo, and the Winged Victory of Samothrace.
The world's most visited museum, set inside a former royal palace with some 35,000 works across three wings. Go for a Wednesday or Friday late opening to avoid the worst crowds.
Possibly the museum with the most treasures in the world. I hardly know where to begin: the Code of Hammurabi, the Victory Stele of Naram-Sin, the Seated Scribe, the Great Sphinx of Tanis. Each one a witness to world history. I have a dream. One day, when I retire, I will rent a place next to the Louvre for a month and go every single day.