What is the most expensive film of all time?

The most expensive movie production ever made was "Avengers: Endgame" (2019) which cost around $356 million to produce. This movie was a part of Marvel Cinematic Universe and is considered as one of the most successful movies in terms of box office collection and popularity.

However, it's worth noting that the cost of a movie can vary widely and can change over time due to inflation and other factors. It's also important to keep in mind that the reported budget for a movie is not always entirely accurate and can be subject to adjustments and adjustments, and the final cost of a movie can be much more than it is reported.

Additionally, there are other movies which were also considered as some of the most expensive movies ever made such as "Pirates of the Caribbean: On Stranger Tides" (2011) and "Pirates of the Caribbean: At World's End" (2007) which reportedly cost around $378.5 million and $300 million respectively.