The Temple of the Sibyl is a colonnaded round monopteral temple-like structure at Puławy, Poland, built at the turn of the 19th century as a museum by Izabela Czartoryska.
Wikipedia https://en.wikipedia.org/wiki/Temple_of_the_Sibyl
Address Puławy 24-100, Poland
Coordinates 51°24'38.148" N 21°57'46" E