There were originally five of these built in different cities colloquially called Jantar Mantar [four survive to this day]. The most famous of them arguably lies in the western city of Jaipur, India attracting both domestic and foreign tourists. This one is a small location lying sandwiched across ‘ghats’ along the riverside.

I think this was the place where Buddha first met his original disciples. This place was given a facelift later around 16th century.

Arch Linux also stands for I can’t configure Gentoo. :p