Meditaion

The inverted triangle is visualized at the lower end of the spine, or more accurately, at the perineum, the base of the torso. While controlling and directing one's breathing, and visualizing specific colors (corresponding with specific mental and bodily functions, musical tones, etc.) one's center of attention gradually shifts upward, being imagined in successively higher locations until it reaches the crown of the head where it joins the other triangle that has its apex pointed upward. This overlapping of triangles forms the emblem of the mysterium conjunctionis, or Seal of Solomon, visualized as settling down into the center of the chest, that part of our physical anatomy we conven-tionally associate with the "heart": in an ancient sense, the "soul."

From: Oscar Ichazo, The Human Process for Enlightenment and Freedom, Arica Institute, New York (1976), p. 78 f., and p. 92. ]
The Arica School was founded in 1968 by Bolivian-born Oscar Ichazo.

Milk Grotto Bethlehem

There's a 5th century Hexagram on the mosaic of the Milk Grotto of the Lady Mary in Bethlehem.
I saw a photo of this mosaic in Bagatti, Bellarmino, Gli antichi edifici sacri di Betlemme :in seguito agli scavi e restauri praticati dalla custodia, Franciscan Printing Press, 1952 Jerusalem---Israel-Museum-Lib.( 1/ 0) fot. 99 Alcuni motivi del musaico costruito sopra la Grotta del Latte. 

Prince Albert memorial Manchester England

In Manchester, in Albert Square, at the front of the Town Hall, is 73 feet high Prince Albert Memorial. Above the statue there's a canopy with four sides, each with a big hexagram. It had been built in 1866 and designed by architect Thomas Worthington (1826 – 1909).
Picture is courtesy of "TE Williams" who published it on Flickr.