Museum: The World's Fair introduces two new mechanisms to Museum.
The first new mechanism is the 'Pavilion' which introduces new shared objectives.
The second new mechanism is 'Loans.' Loans allow you to send an item to another player's museum which will benefit both of you. This is not available in the two player game.
The World's Fair expansion also includes three tower boards as well as additional events, personnel, and character cards.
—description from the publisher
Publisher: Holy Grail Games