Four-Sided Pyramid is a conceptual modular "structure", by Sol LeWitt, in the National Gallery of Art Sculpture Garden.
The artist created a plan and Four-Sided Pyramid was constructed by others, in 1999.
Wikipedia https://en.wikipedia.org/wiki/Four-Sided_Pyramid
Address 708 Madison Dr NW, Washington 20004, United States
Coordinates 38°53'27.237" N -77°1'20.524" E
