Tlemcen is a beautiful city in northwestern Algeria, rich in history and culture. Here are some of the top sightseeing places to visit in Tlemcen:

1. Great Mosque of Tlemcen: This mosque is one of the most significant Islamic monuments in Tlemcen and is known for its beautiful architecture, intricate designs, and historical significance.
2. El Mechouar Palace: Built in the 13th century, this palace features stunning architecture, beautiful gardens, and a museum that showcases the history and culture of Tlemcen.
3. Mansourah Mosque: This mosque is one of the oldest in Tlemcen and is known for its beautiful minaret and intricate designs.
4. Tlemcen National Park: Located on the outskirts of the city, this park is a natural oasis with beautiful scenery, hiking trails, and picnic areas.
5. Beni Add Caves: These caves are located in the nearby Beni Add Mountains and are known for their beautiful rock formations and underground streams.
6. Lalla Setti Plateau: This plateau is located on the outskirts of Tlemcen and is known for its stunning views, hiking trails, and natural beauty.