1944 Masterpiece Art returned to Museum After WW2

The Metropolitan Museum in New York has retrieved its rare art treasures, which were hidden for two years to protect them from potential enemy air raids. These treasures, including Dutch masterpieces, were stored in the Stotesbury mansion near Philadelphia under utmost secrecy. Now, they have been returned to the museum, enriching America's most comprehensive art collection with priceless paintings, including fine examples of Dutch art.

What was the reason for the art treasures being hidden for two years?

Who made a rare public appearance to see the Dutch masterpieces returned to the museum?

Where were the art treasures stored during their time away from the museum?

What was maintained in utmost secrecy regarding the art treasures?

What type of paintings are included in America's most comprehensive collection of art?