The fearless five hit a museum in st petersburg russia which museum did they infiltrate

The State Hermitage Museum in St. Petersburg, Russia was infiltrated by the fearless five.

Explanation:

Founded in 1764 by Catherine the Great, the State Hermitage Museum or Winter Palace is on record as the world's second largest museum. The museum was started with only a few pieces of art acquired from Johann Ernst, a Berlin merchant. Today the museum hosts 3 million pieces of world cultural artifacts. In initial stages only some had the access to visit the buildings of the museum.