Being one of the four most major pilgrimage sites of Buddhism, Sarnath has a number of temples built by members of countries with large Buddhist populations. Among these countries is Thailand. (FYI: There is also a Chinese Temple, a Japanese Temple, and a Tibetan Temple.) While the guidebook advice is that these modern temples are skippable, an exception might be made for Wat Thai, which is both nearby to the [unskippable] Archaeology Museum and has a giant Buddha statue.
Here is the sign for the giant Buddha.