For a fascinating history lesson, visit the crumbling ruins of Prang Khaek and try to imagine how it must have looked in its heyday.
You're spoiled for sightseeing choice when spending time in Lop Buri. Prang Khaek is an ideal place to kick off here, but there are numerous other fine sights to visit. Phra Prang Sam Yod, Temple of Great Jewel Relic, and King Narai National Museum are close to the once-important structure and will round out your day nicely.