One of the best things about the City of Light is how easy it is to make international day trips from Paris by train. That’s definitely not something I grew up with: You can make an international trip from New York City by train — but only if you want to go to Montreal, and only if you have at least three days, because it’s a 12-hour trip each way. From Paris, you can reach London by train in a little over two hours. Belgium, the Netherlands, Switzerland, Germany and others aren’t much farther.