A covered walkway is a type of structure that provides protection from the elements while allowing people to move from one place to another. The term can refer to a variety of structures, such as a STOA, which is a roofed colonnade typically found in ancient Greek architecture; a CLOISTER, which is an enclosed courtyard surrounded by a covered walkway; an ARCADE, which is a series of arches supported by columns; a PERGOLA, which is a structure made of posts and beams with a lattice roof; a PORTICO, which is a porch-like structure with a roof supported by columns; a RAMP, which is a sloping walkway; a PATH, which is a walkway made of paving stones or gravel; and a PIER, which is a raised platform extending out into a body of water.