You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Plymouth

Context:
The early port settlement of Plymouth, called "Sutton", approximates to the area now referred to as the Barbican and has 100 listed buildings and the largest concentration of cobbled streets in Britain. The Pilgrim Fathers left for the New World in 1620 near the commemorative Mayflower Steps in Sutton Pool. Also on Sutton Pool is the National Marine Aquarium which displays 400 marine species and includes Britain's deepest aquarium tank.

Question:
How many listed buildings are present in the Barbican area?

100