At that time, the two groups were split nearly 50/50, with around 3.3 billion people apiece.

Today, the percentage of people living in urban areas has grown to over 55%, and is expected to reach 68% by 2050. Due to this trend, many of the world's largest cities have become home to tens of millions of people.

In response to such incredible density, governments, businesses, and households have installed countless security cameras for various purposes including crime protection. To grasp the scale of this surveillance, Visual Capitalist's Marcu Lu used data from a recent report by Comparitech to visualize the most surveilled cities in the world.

The top four cities all belong to India, which is the world's second largest country by population. Surveillance cameras are playing a major role in the country's efforts to reduce crimes against women.

Further down the list are cities from a variety of countries. One of these is Russia, which has expanded its use of surveillance cameras in recent years. Given the country's track record of human rights violations, activists are worried that facial recognition technology could become a tool of oppression.

The only U.S. city on the list is Los Angeles, which contains some of the country's wealthiest neighborhoods and municipalities. That includes Beverly Hills, which according to the Los Angeles Times, has over 2,000 cameras for its population of 32,500. That translates to about 62 cameras per 1,000 people, meaning that Beverly Hills would finish at #2 in the global ranking if it were listed as a separate entity.