Washington, Italy
Four-Sided Pyramid is a conceptual modular "structure", by Sol LeWitt, from 1965. It is located in the National Gallery of Art Sculpture Garden, in Washington, D.C.. The artist created a plan and Four-Sided Pyramid was constructed by others, in 1999.
Listen to the audio guide for Four-Sided Pyramid Free on WIP — starts by itself when you arrive, even with the screen off