Torre Tavira, along with the Cathedral bell tower, offers the best views of Cadiz. You'll see a whole different perspective of the city from above. The tower itself is one of over 140 watchtowers in Cadiz and is located close to the market. What makes it unique is it also the home of the first Camera Obscura in Spain - a combination of a telescope and mirrors/lenses that allow real time images to be projected onto a circular screen inside. The first two levels of the tower have exhibitions and information on the history of the camera obscura and Cadiz in the 18th century. The third level houses the camera obscura itself, and above is a fantastic rooftop terrace with uninterrupted views of the entire city. To visit the tower you'll need to make a reservation online. Due to the pandemic numbers are tightly controlled. I booked the night before and had no problems but in peak tourist season you might need to book further in advance. The tower is open between 10am - 6pm October - April and 10am - 8pm May - September. The price is 7 euros. You'll typically spend about 30-40 minutes here. 15 minutes consists of viewing the camera obscura with a guide that will explain how it works and show you a 360 degree live view of Cadiz. They also point out many of the main attractions of Cadiz and explain the differences between the 4 main types of towers. Some of the points of interest are impossible to see from anywhere on the streets including the oldest tower. The rest of the time you are free to look at the exhibitions and view the city from the roof terrace. I was booked on the Spanish speaking tour but the guide spoke both Spanish and English.