1. Kronborg Castle, also known as Kronborg Slot, is a famous castle located in Helsingør, Denmark. It was built in the late 16th century by King Frederick II and is known for its architectural beauty and historical significance. The castle is famous for being the setting of William Shakespeare’s play \"Hamlet.\" In addition, Kronborg Castle was once an important military fortress and played a crucial role in protecting Denmark from invading forces. Today, it is a popular tourist destination and a UNESCO World Heritage Site.

2. Kronborg Castle is open for visitors throughout the year. The working hours may vary depending on the season. The castle is closed on Mondays. You can contact the castle administration at +45 4921 3077 for further information.

3. Tickets for Kronborg Castle can be purchased online or at the castle entrance. The ticket prices vary depending on age, with discounts available for students and senior citizens. The castle can be easily reached by train from Copenhagen, with the journey taking around 40 minutes.