Sarai Kala is one of the lesser-known archaeological mounds in the Taxila area, overshadowed by Sirkap, Jaulian, and the main museum but still part of the same long settlement landscape. It helps show that Taxila was not a single ruin but a cluster of sites across valleys and ridges.
The stop is mainly for travellers with a deeper interest in archaeology. Go with a guide or solid map context, because the remains are subtler than the headline monasteries and city plans.