1. Chapultepec Castle (Castillo de Chapultepec) in Mexico City is a historic site and a must-visit landmark for tourists. It is located on top of Chapultepec Hill and offers stunning views of the city. The castle has served various purposes throughout its history, including being a home for the Mexican Emperor Maximilian I and his wife Empress Carlota, a military academy, and currently, it houses the National Museum of History.

2. The working hours of Chapultepec Castle are from Tuesday to Sunday from 9:00 AM to 5:00 PM. The castle is closed on Mondays. For more information, you can contact them at +52 (55) 4040 5215.

3. The entrance fee to Chapultepec Castle is relatively affordable, and there are discounts available for students, teachers, and seniors. To get there, you can use public transportation such as the Metro (Line 1 - Chapultepec Station) or take a taxi. Additionally, there are buses that also stop near the castle. Overall, Chapultepec Castle is a fascinating destination with a rich history that offers visitors a unique insight into Mexico's past.