A sacred mountain?
"Professor," Sato pressed, "does that mean anything to you?"
I told him how to solve it.
Sato shook her head. "The pyramid's gone. We've looked. He took it with him."
Langdon remained silent a moment, closing his eyes and trying to recall what he had seen on the base of the pyramid...I may be able to remember enough, but I need you to look up something on the internet..."
"Run a search for "The Order Eight Franklin Square'"
My God.
Is that what he's looking for?
A word?
Is it that simple?
The Lost Word is what he's looking for! that's what he believes is buried here in Washington"
(TLS 417-18).
"I can't remember all the symbols!
Langdon closed his eyes, doing his best to recall the precise locations of the symbols on the bottom of the stone pyramid, but even his edetic memory did not have that degree of recall. He wrote down the few symbols he could remember, placing each one in the location indicated by the Franklin magic square"
Then it came to Langdon
just like~
abba~ cadabra!!
What's this

Looks like~ Greek to me?
Heredom??
"Heredom n. a significant word in "high degree" Freemasonry, from French Rose Croix rituals, where it refers to a mythical mountain in Scotland, the legendary site of the first such Chapter. From the Greek Hepedou originating from Hieros-domos, Greek for Holy House"
"That's it!" Langdon exclaimed, incredulous. "That's where they went!" Sato had been reading over his shoulder and looked lost. "To a mysthical mountain in Scotland?!"
Langdon shook his head. "No, to a building in Washington whose code name is Heredom."
(TLS 421-22).
The House of the Temple~
Known among its breathren as Heredom~
The crown jewel of the Masonic Scottish Rite in America