The Infinite Corridor

The Infinite Corridor in the Massachusetts Institute of Technology is a hallway connecting its main buildings, and serving as a direct route between the eastern and the western campus. It's notable because it is 251 meters long, and filled with bulletin boards.

The corridor has been used to demonstrate the speed of light in a simple experimental setup, to model highway traffic (or rather, foot traffic), and is often involved in practical jokes – an April Fools' Day post suggested that the corridor floor would be replaced with a moving walkway.

Twice per year, the corridor lines up with the plane of the ecliptic, so that its entirety is filled with sunlight, an event celebrated under the name MIThenge. There is a special MIThenge etiquette, including rules like "Don't block the corridor" and "Don't hurt your eyes".