Who:   Tourists with an interest in architecture or unique photographic opportunities.
What:   EUR was a suburb founded by Mussolini that was intended for a Universal Exhibition celebrating Fascist Italy. It was planned during the 1930's and was supposed to open in 1942. A little thing called World War II halted the project.
Why:   It's fascinating to see the buildings and museums Mussolini intended to celebrate fascism that have remained long after fascism ended.