Short answers, pulled from the story.
The Great Bath at Mohenjo-Daro in modern-day Pakistan is most likely the first swimming pool ever built. It was dug during the 3rd millennium BC, measures 12 by 7 metres, and was lined with bricks sealed with a tar-based coating.
The largest swimming pool in the world is San Alfonso del Mar Seawater pool in Algarrobo, Chile. It is 1,013 metres long, covers an area of 8 hectares, and reaches a maximum depth of 3.5 metres. It was completed in December 2006.
Deep Dive Dubai in Dubai, UAE, is certified by the Guinness Book of World Records as the world's deepest swimming pool at 60 metres. It received that certification in 2021, taking the record from Italy's Y-40 pool at the Hotel Terme Millepini in Padua, which had held the title since 2014 with a depth of 42.15 metres.
The Olympic-size swimming pool was first used at the 1924 Olympics. Under FINA standards, it must be 50 by 25 metres wide, divided into eight lanes of 2.5 metres each, with a minimum depth of 2 metres and water kept between 25 and 28 degrees Celsius.
New Zealand, with a recorded population of 4,116,900, holds the record for pools per capita. The country has 65,000 home swimming pools and 125,000 spa pools.
The first heated swimming pool was built by Gaius Maecenas in his gardens on the Esquiline Hill of Rome, likely sometime between 38 and 8 BC. Maecenas was a wealthy imperial advisor to Augustus and is considered one of the first patrons of arts.