Mural (noun)

1. A large painting, typically one executed directly on a wall.
2. A picture painted or affixed directly on a wall or ceiling.

Origin:

From latin muralis, from murus ("wall").

Examples:

1. The building's lobby featured a beautiful mural of a mountain landscape.
2. The school commissioned a local artist to paint a mural on the gymnasium wall.
3. The museum had a collection of ancient murals.
4. The city's downtown area featured several large murals on buildings.
5. The ceiling of the Sistine Chapel features a famous mural by Michelangelo.