Indigo Olive Checkerboard Guestbook

Renowned for his contribution to the famous Arc de Triomphe, the French mining engineer, Louis-Étienne Héricart de Thury, kept a guestbook. It was stationed not at the entry or on a lobby stand. Instead, it was at the exit of one of Paris' longest established catacombs, The Ossuary, which Héricart de Thury finished renovating in the early 1800s.
Unfortunately, the Ossuary's guests listed were usually persons not leaving the underground cemetery. Yes, for funeral repasts, and gladly the Indi...