The Gleno Dam in Valle di Scalve, Italy, was built between 1916 and 1923, and collapsed on December 1, 1923, just two months after its completion, killing at least 356 people. Source.
A replica Notre Dame de Paris was created by Universal Studios for the 1923 extravaganza The Hunchback of Notre Dame. The upper part of the cathedral is actually a miniature suspended in front of the camera. Source.