Short answers, pulled from the story.
The Great Bath at Mohenjo-Daro in modern-day Pakistan is the earliest known swimming pool, excavated during the 3rd millennium BC. This ancient structure was lined with bricks and sealed with a tar-based substance to prevent leakage.
Gaius Maecenas, a wealthy imperial advisor to Augustus, commissioned the first heated swimming pool in history sometime between 38 and 8 BC on the Esquiline Hill of Rome. This innovation transformed the pool from a simple water basin into a luxury amenity for the wealthy.
Swimming pools gained widespread popularity in Britain during the mid-19th century, driven by public health concerns and the need for organized recreation. The Maidstone Swimming Club, formed in 1844 in Maidstone, Kent, emerged as a response to drowning incidents in the River Medway.
New Zealand holds the record for pools per capita with a population of 4,116,900. The country boasts 65,000 home swimming pools and 125,000 spa pools.
The San Alfonso del Mar Seawater pool in Algarrobo, Chile, is the largest swimming pool in the world, completed in December 2006. It stretches 1,013 meters long with an area of 8 hectares and reaches depths of 115 meters.
The Americans with Disabilities Act, implemented in 2012, mandated that large swimming pools provide at least two modes of accessible entry. This regulation led to the rise of zero-entry pools featuring a gradual slope from the deck into the water.