Tractor Trailer Tours The Magical History Tour takes you to the restrictted areas of the site with experienced guides. Included in your ticket for our Sundays at the Mills Explore our scheduled monuments within 170 acres of woodland, canals and open space. Discover the secrets of structures such as the Grand Nitrator and Quinan Stove, dating from the Victorian to post war periods. You can also book a tractor trailer tour for Group Visits when the site is closed to the public. Lucky deer sighting Massive blast proof walls Monuments in the woods Learn the secret of the not so tranquil pool Manage Cookie Preferences