Indy discovers the Spider Lamp in Herrera's hidden treasure room.
The Spider Lamp was a rare and valuable artifact discovered in the 1930s by treasure hunters in the Site R temple complex in Mexico.
Marcus Brody found out that the artifact was in the private collection of local landowner Señor Herrera and asked Indiana Jones to recover it. Indy successfully infiltrated Herrera's house, and found the artifact among numerous other stolen items.[1]