Gros Horloge is a famous astronomical clock and a popular tourist attraction located in the historic center of Rouen, France. The clock is one of the oldest working astronomical clocks in Europe and dates back to the 14th century.

The Gros Horloge consists of a large belfry tower that stands over 45 meters tall and is topped with a Renaissance dome. The clock itself is located at the base of the tower and features a complex mechanism that includes an astrolabe, a calendar, and a planetary system. The clock face is made of gold-plated copper and features Roman numerals.

Visitors can climb the tower to see the clock mechanism up close and enjoy panoramic views of the city from the top. There is also a museum located within the tower that provides information about the history of the clock and its role in the daily life of Rouen.

The Gros Horloge is one of the most recognizable landmarks in Rouen and is a must-see for anyone interested in history or mechanical engineering. It is also a popular meeting place for locals and visitors alike.