Before Christianity became the Roman Empire's official religion in the 4th Century, 'mystery religions,' organized around a central canon of secret knowledge, were widespread. Membership in such religions was limited to people who had passed through secret initiation rituals and had begun to learn a body of hidden knowledge.

The most famous secret base, I guess, would be Area 51, which a lot of people have heard of as a kind of mythical place. Well, it's a real place.

In religion, symbols have always played a iconographic and ritualistic role. Different symbols might represent different theological ideas.

Trevor Paglen Quotes