a young man seated on a rock with the Colosseum in Rome in the background

Smithson at the Colosseum in Rome, in 1961. This photograph was taken during Smithson's first visit to Rome when George Lester offered him his first solo international exhibition at Galleria George Lester, where he explored quasi-religious subject matter. 

Poster with text in upper left and pen and ink drawing of angels, monsters, and horses interacting

An exhibition poster for Robert Smithson's 1962 solo exhibition at Richard Castellane Gallery,  New York, NY. This was the first of Smithson's two solo exhibitions with Castellane Gallery in 1962.

 24 x 18 in. (61 x46 cm.)

black and white photograph of a man and woman sitting on floral pattern sofa. Man has his arm around the woman and she is looking at the camera.

Nancy Holt and Robert Smithson marry in New York on June 8, 1963.  This photograph of them was taken on Christmas, 1963.

Nancy Holt standing by shore of lake with sunglasses on and short brown hair.

Nancy Holt visits the American West for the first time with Smithson and Michael Heizer. Shoots film Mono Lake with Smithson and Heizer at California’s Mono Lake.

Photo: Michael Heizer

Two men in swimsuits leaned over pushing a tree stump on a sandy beach.

Robert Rauschenberg helps Smithson drag a tree out of the water and onto the beach on Captiva Island, Florida, in order to create Smithson's Upside Down Tree II.

Nancy Holt's face reflected in a circular mirror

Nancy Holt first presents her installation work Holes of Light in a solo exhibition at the LoGiudice Gallery.

Three figures standing at the site of Amarillo Ramp in Texas

While photographing Amarillo Ramp, Smithson dies in a small airplane accident, along with pilot Gale Ray Rogers and photographer Robert E. Curtin. Richard Serra, Nancy Holt, and Tony Shafrazi complete Amarillo Ramp one month after his passing.

Nancy Holt standing inside one of the large tunnels that are part of Sun Tunnels. Blue sky and sunny and Nancy is wearing a blue top and blue jeans.

Holt completes construction of her most discussed work, Sun Tunnels in Utah’s Great Basin Desert.  

Nancy Holt standing in a circular hole at her work Stone Enclosure: Rock Rings

Working with Professor Lawrence Hanson and stonemason Al Poynter among others, Holt constructs Stone Enclosure: Rock Rings at Western Washington University in Bellingham, Washington.

A series of interconnected steel conduit and lightbulbs in a room.

Holt constructs and exhibits her first Electrical System works: Electrical System (For Thomas Edison) and Electrical System II: Bellman Circuit [pictured].

Nancy Holt sitting in an old juniper tree in New Mexico

Nancy Holt moves to Galisteo, New Mexico.

Photo: Lucy Lippard, 1998

large earthwork sculpture made using earth, concrete, water, and grass with people moving around on top of it.

Holt completes a major earthwork in Nokia, Finland titled Up and Under. 

Nancy Holt, Up and Under (1987-98)

Location: Pinsiö, Finland

Materials: sand, concrete, topsoil, grass, water

Overall surface area: 14 acres (5.7 hectares)

Mound: height ranges from 11 to 26 ft. (3.5 to 8 m), with a length of 630 ft. (192 m)

Tunnels: length 241 ft. (74 m), with a diameter of 10 ft. (3 m)

Orientation: using the North Star as true North, the tunnels are on north-south and east-west axes

© Holt/Smithson Foundation/licensed by VAGA at ARS, New York

A large white walled room with benches and projected images on two hanging screens and images on the wall.

From 2010 through 2012 the retrospective exhibition Nancy Holt: Sightlines (curated by Alena J. Williams) travels from the Wallach Art Gallery, Columbia University to Badischer Kunstverein in Karlsruhe, Tufts University Art Gallery in Boston, the Graham Foundation in Chicago, Santa Fe Arts Institute, and the Utah Museum of Fine Arts in Salt Lake City.

Photograph: Stephan Baumann