For those standing atop the minaret, everything is within reach of the eye, including famous places and monuments of the capital such as the ancient city of the Casbah, the Cathedral of Notre Dame d'Afrique, and El Aurassi Hotel.

They watched the renowned Liaoning Ballet Troupe perform segments from their upcoming production of "Notre Dame," created in collaboration with foreign choreographers.

In April, the oak-framed roof of Notre Dame Cathedral in Paris was burned to the ground in a blaze, causing immeasurable loss.

Timothy Carone, an autonomous systems expert and professor at Notre Dame University's Mendoza College of Business, said autonomous technology's proponents must "find the right balance so the technology is tested right, but it isn't hampered or halted".