Robert Smithson is widely recognized as a pioneer of Land Art. His iconic work, "Spiral Jetty," created in 1970, is a large-scale earthwork constructed from black basalt rocks and salt crystals in the Great Salt Lake, Utah.

Land Art encompasses a range of artistic practices that involve creating art in natural settings, using natural materials, and exploring the relationship between art and nature. It challenges traditional notions of art and its display, often existing in remote or inaccessible locations.

Land Art typically involves earthworks, sculpture, and installation, which are created using natural materials and often involve large-scale modifications to the landscape. Painting is not a common technique associated with Land Art.

Land Art serves multiple purposes, including beautifying the natural environment, raising awareness about environmental issues, and challenging traditional notions of art. It often aims to create a dialogue between humans and the natural world, encouraging viewers to contemplate their relationship with the environment.

Michael Heizer is renowned for his large-scale earthworks in the desert, particularly his "Double Negative" (1969-1970) in Nevada, which consists of two massive trenches carved into the desert floor.

Using natural materials in Land Art serves several purposes. It minimizes the impact on the environment, creates a sense of harmony between the artwork and its surroundings, and emphasizes the impermanence of art, as natural materials are subject to change and decay over time.

Tree Mountain, created by Agnes Denes in 1996, is a Land Art project that involved planting 11,000 trees in a grid pattern on a former landfill in Philadelphia, Pennsylvania.

Walter De Maria's "Lightning Field" (1977) is a large-scale installation in the New Mexico desert, consisting of 400 stainless steel poles arranged in a grid pattern, designed to attract lightning strikes.

Nancy Holt's "Sun Tunnels" (1973-1976) is a Land Art project located in the Great Basin Desert of Utah. It consists of four concrete tunnels aligned with the solstices and equinoxes, allowing sunlight to pass through and create a unique visual experience.

James Turrell's "Roden Crater" is an ongoing Land Art project located in the Arizona desert. It involves transforming a volcanic cinder cone into a large-scale observatory, allowing viewers to experience celestial events in a unique and immersive way.

Christo and Jeanne-Claude's "Wrapped Reichstag" (1995) was a temporary Land Art installation in Berlin, Germany, where the Reichstag building was entirely wrapped in silver fabric, creating a striking and iconic visual statement.

Richard Long's "A Line Made by Walking" (1971) is a Land Art project where he walked a straight line across the Sahara desert, leaving a temporary trace of his journey in the sand.

Andy Goldsworthy is known for his ephemeral Land Art projects using natural materials. His "Ice and Snow Sculptures" involve creating intricate and delicate sculptures using ice and snow, which gradually melt and change over time.

Maya Lin's "Vietnam Veterans Memorial" (1982) is a black granite memorial in Washington, D.C., honoring the American soldiers who died in the Vietnam War. It is considered a significant work of Land Art for its minimalist design and powerful emotional impact.

Agnes Denes' "Wheatfield - A Confrontation" (1982) was a Land Art project where she planted a field of wheat in a vacant lot in Manhattan, New York City, highlighting the contrast between urban and rural environments.