Four-Sided Pyramid, by artist Sol Lewitt, was fabricated in 1999 of concrete blocks and mortar. It is located in the Sculpture Garden of the National Gallery of Art.
Directions: Constitution Ave NW & 7th St NW, Washington DC .
Last visited: September 2019.
Standard disclaimer: Sites are described for entertainment purposes only, as they were at the time of my last visit. I can not vouch for the current condition of the site or its accessibility.