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:
Pope_Paul_VI

Context:
As a Cardinal, Montini journeyed to Africa (1962), where he visited Ghana, Sudan, Kenya, Congo, Rhodesia, South Africa, and Nigeria. After his journey, John XXIII gave him a private audience on his trip which lasted for several hours. In fifteen other trips he visited Brazil (1960) and the USA (1960), including New York City, Washington, DC, Chicago, the University of Notre Dame in Indiana, Boston, Philadelphia, and Baltimore. While a cardinal, he usually vacationed in Engelberg Abbey, a secluded Benedictine monastery in Switzerland.

Question:
Where did Montini like to use as a retreat as a cardinal?

Engelberg Abbey