The Poltava Battle History Museum covers the 1709 battle that changed the balance of power in northern and eastern Europe. Peter the Great's victory over Charles XII of Sweden helped establish Russia as a major European power, and the museum sets that story on the landscape where it happened.
The wider reserve includes monuments, burial mounds, and the Swedish cemetery. It is a history-heavy stop, but a rewarding one if you want to understand why Poltava's name carries so much weight beyond Ukraine.