We came across this Paris-style Metra entrance in Chicago the other day. It is based on the famous Art Nouveau Metro entrances by Hector Guimard. The entrance to the Van Buren station was given to Chicago by the city of Paris in 2001. The cast iron entrance was taken from the original molds.
Here is the original in Paris (photo by adfoto), which was introduced to Paris in the early 1900s.
There is also one in Montreal. I wonder if there are any anywhere else.