Discretely situated in the 5th arrondissement, these Roman ruins are easy to miss. They're a great place to come, however, if you're looking for a bit of greenery and a breath of fresh air in a friendly neighborhood setting. The ruins were first unearthed in 1869, and have since been excavated and landscaped. Parts of the Roman amphitheatre are clearly visible - a testament to the Romans who founded the city of Lutetia, as Paris was first called. On weekends, expect to find families and loads of children running around. Or bring a book and a sandwich on a sunny weekday, and enjoy the peace and quiet.