Sir Hiram Maxim had a small factory at 57 Hatton Garden and in 1881, invented and started to produce the Maxim Gun, a prototype machine gun, capable of firing 666 rounds a minute. Hatton Garden has an extensive underground infrastructure of vaults, tunnels, offices and workshops. The area is now home to many media, publishing and creative businesses, including Blinkbox and Grey Advertising. Surrounding streets including Hatton Place and Saffron Hill (the insalubrious setting for Fagin's den in "Oliver Twist") were improved during the 20th century and in modern times have been developed with blocks of 'luxury' apartments, including Da Vinci House (occupying the former "Punch" magazine printworks) and the architecturally distinctive Ziggurat Building.