Paris

Everyone knows the Eiffel Tower, or Tour Eiffel. You could probably draw a pretty accurate sketch without even looking. And quite a few folks know that that Gustave Eiffel, who designed and built it, also provided the iron skeleton that keeps the Statue of Liberty standing in New York Harbor.

The Old Mill is a survivor. Built onto a bridge to save money, it still stands, but the bridge is gone. Not only the one it first stood on, but several of its replacements. 

Paris to Barcelona has been a difficult trip by train, requiring at least one change and some slow trains. Now, the two cities have been linked by a direct French TGV train that makes the trip in 6h25m, challenging the airlines.