Paris' centuries-old Louvre Museum — home of da Vinci's iconic Mona Lisa — is getting an $800 million makeover, and American visitors will have to help pay for it.

The Natural History Museum is also a favorite among families, so you'll find it crawling with kids. Recent travelers praised the museum for its free admission and near endless exhibits.

Head to this museum to discover over 600,000 items relating to the history of France, ranging from a prehistoric dugout canoe from 4600 BC to street signs and scale models of its ancient monuments. It ...