One of many favourite quotes from the Watchtower's own official history (1995)
PROCLAIMERS *** jv chap. 14 p. 200 “They Are No Part of the World” ***
Practices That Have Been Abandoned
For some 35 years, Pastor Russell thought that the Great Pyramid of Gizeh was God’s stone witness, corroborating Biblical time periods. (Isa. 19:19) But Jehovah’s Witnesses have abandoned the idea that an Egyptian pyramid has anything to do with true worship.