The murals in the Denver International Airport, the pyramid on the reverse side of the Great Seal of the United States with the words Novus Ordo Seclorum meaning “New Order of the Ages”, Masonic signs on buildings, and pentagrams designed in city plans. The documentary Riddles In Stone: The Secret Architecture of Washington D.C. investigates many peculiarities of the streets and buildings in the District of Columbia.
Freemasons were involved in the design of the Great Seal of the United States, which contains many symbols. Masonic Lodge members see hidden meanings in the seal. The triangle (Greek letter Δ) is the universal symbol that represents change; the eye on the seal completes the triangle, implying change. Also, the number thirteen appears in symbols multiple times on the seal.
Signs and symbols have been found in the Vatican, Roman Catholic and Protestant churches, Mormon temples of the The Church of Jesus Christ of Latter-day Saints, and on the clothing of various clergy. The Knights of Columbus and the Sovereign Military Order of Malta, like Freemasonry, use many complex rituals and symbols.
Those in authority often code speeches and writings for secrecy with special words and phrases: laying the foundation, the reality is, on the level, by the square, paving the way, telling the story, work, design, and other architectural terms, e.g., Roman Catholic Archbishop of Washington D.C., Donald Wuerl, speaking upon his appointment referring to “the Architect” and “this is already a big step forward in that world we want to create”.