Langdon looked out at the towering stone bastions that loomed ahead-impenetrable fortifications surrounding the complex …. a strangely earthly defense for a spiritual world of secrets, power, and mystery.
"If there is another way in," he said, "it’s probably recessed in the rear bastion-more of an escape route than an entrance."
He sprinted toward the bastion, running on fumes, gazing upward at the citadel’s circular core as it shot skyward to a gargantuan, sword-wielding angel.
Leaning out, he grabbed the top of the first bulwark, dragged himself onto the wall, and dropped onto the castle’s lower bastion.
The tunnel inclined steeply as it left the Castle St. Angelo, proceeding upward into the underside of a stone bastion that looked like a Roman aqueduct.
There are no more uses of "bastion" in the book.
Show samples from other sources
These rules are a bastion against corruption.
The universities were the last bastion of freedom, but they were purged of anyone who questioned official propaganda shortly after the coup.