The President of the United States is authorized, in his discretion, to declare by public proclamation historic landmarks, historic and prehistoric structures, and other objects of historic or scientific interest that are situated upon the lands owned or controlled by the Government of the United States to be national monuments, and may reserve as a part thereof parcels of land, the limits of which in all cases shall be confined to the smallest area compatible with proper care and management of the objects to be protected.–Section Two of the Antiquities Act, 1906What did the Antiquities Act protect? Check all that apply. natural structureshistoric landmarkstenement buildingsmanufacturing facilitiesareas of historic interestareas of scientific interest