All Illustrations
Mammillaria grahamii & M. barbata 
The Circle of Traitors: Dante Striking against Bocca degli Abati 
The Pit of Disease: The Falsifiers 
The Ditch of Thieves: The Serpent Attacking Buoso Donati 
The Ditch of Thieves: The Six-Footed Serpent Attacking Agnolo Brunelleschi 
The Ditch of the Corrupt Officials: The Baffled Devils Fighting 
The Ditch of the Corrupt Officials: Devils Tormenting Ciampolo 
The Circle of the Lustful: Francesca da Rimini 
Large Potter's Wheel 
Wieliczka Salt Mine 
Soap Making 
Woman Blowing a Glass Pearl