Fire escape

Fire escapes were special emergency exits placed on the side of buildings in case there was a fire in the building.

When Theodore Benik raided Giles Kent's office, Benik placed guards on the fire escape to prevent Kent from escaping. (TV: The Enemy of the World)

Rory saw a fire escape in the Minotaur's prison ship,but it went unnoticed by everyone else.(TV:The God Complex)