Democracy Monument is somewhere that you might visit on the way to somewhere else in Bangkok but it is certainly a place that you should visit.
อนุสาวรีย์ประชาธิปไตย - Anusawari Prachathipatai - is a public monument in the centre of Bangkok, capital of Thailand. It occupies a traffic circle on the wide east-west Ratchadamnoen Klang Road, at the intersection of Dinso Road. The monument is roughly halfway between Sanam Luang, the former royal cremation ground in front of Wat Phra Kaew, and the temple of the Golden Mount (Phu Kao Thong) - Wikipedia. I want to get a bit closer but there was traffic - intermittent but sometimes very fast.
The Giant Swing was something that I came across more than aimed for if the truth be told.
I understand that it was built in 1784 and was traditionally used in swing ceremonies - an annual swinging ceremony known as Triyampavai-Tripavai was held at Giant Swings of major cities until 1935. I think that it is a Hindu Ceremony?
If you visit the Bangkok National Museum (พิพิธภัณฑสถานแห่งชาติ พระนคร) they display the original timbers that were used for this. Surrounding it are places which you must visit - Wat Suthat Theo Wararam, Tiger God Shrine, Deasathan and more