<prompt> Translate the following text to EnglishSehemu ya juu ya mawe hayo ni stupa ya dharmak yenye urefu wa mita 45 iliyojengwa katika karne ya tano KK, ambayo wengi wanaamini ni mahali pa kale pa hotuba maarufu zaidi ya Buddha.  <response>: The dominant feature of these ruins is the 45-m- 146-ft- high, cylindrical Dhamekh Stupa, built in the fifth century a.d. , which is believed by many to mark the ancient site of Buddhas most famous sermon. 