Lopburi packs an extraordinary amount of history — Khmer, Ayutthaya-era and mid-century military — into a compact, walkable city, wrapped around a famous troop of monkeys. Add the Pa Sak dam and its cool-season sunflowers out in the province, and it rewards far more than the quick day trip most visitors give it.
The best of Lopburi
Phra Prang Sam Yot & the monkeys
Lopburi's signature sight — a Khmer-era three-tower (prang) shrine that has become the "monkey temple", home to the city's celebrated troop of crab-eating macaques. It sits opposite the railway station in the Old Town, alongside the San Phra Kan Kala shrine that the monkeys also colonise. Entry runs a modest 50 baht for foreign visitors (10 baht for Thais); sources differ slightly on closing time — most give roughly 8am to 5 or 6pm daily — so treat evening visits with a little caution and confirm on arrival. Charming and chaotic in equal measure; watch your bags and glasses.
King Narai's Palace (Phra Narai Ratchaniwet)
The walled 1660s royal complex King Narai the Great built when he made Lopburi a second capital, now home to the Somdet Phra Narai National Museum. Its blend of Thai and European (French-influenced) architecture reflects Lopburi's brief moment at the centre of Ayutthaya-era diplomacy — the single most important historic site in the city. The museum keeps Fine Arts Department hours: Wednesday to Sunday, 8:30am–4pm, closed Monday, Tuesday and public holidays. A single ticket (around 150 baht for foreign visitors, 30 baht for Thais; free for uniformed students, seniors 60+, and monks) is reported to cover the museum together with Ban Wichayen and Wat Phra Si Rattana Mahathat below, since all three are Fine Arts Department sites — worth confirming the exact combination at the gate, as ticketing has been known to change.
Ban Wichayen & San Phra Kan
Ban Wichayen is the ruined residence of Constantine Phaulkon, the Greek adventurer who rose to be King Narai's chief minister and received French embassies here in the 1680s; on its own it's a cheap ticket (roughly 10 baht Thai / 50 baht foreign), though it's often folded into the combined palace-sites pass above. Nearby, San Phra Kan (the Kala Shrine) is both a revered spirit shrine and a second monkey stronghold — free to enter, open roughly 7am–6pm daily, with a small donation appreciated for the shrine's upkeep and its resident animals.
Prang Khaek & Wat Phra Si Rattana Mahathat
Prang Khaek is one of the oldest Khmer monuments in the city — a modest brick-tower roadside shrine, free to view. Wat Phra Si Rattana Mahathat, opposite the railway station, is a large ruined temple complex whose central prang and prayer hall show centuries of Khmer, Sukhothai and Ayutthaya influence; it's one of the sites typically included in the Fine Arts Department combined ticket with King Narai's Palace — an atmospheric, low-cost stop right in the Old Town.
Pa Sak Jolasid Dam & the sunflower fields
In Phatthana Nikhom district, the Pa Sak Jolasid Dam is Thailand's largest reservoir by surface area. On cool-season weekends (roughly November into December) the State Railway runs a scenic "floating train" — most recently branded the SRT Royal Blossom — across the dam wall, where rising water makes the track appear to float; the excursion typically pairs the dam crossing with a stop at the surrounding sunflower fields (thung thantawan), which bloom their fullest in December. Confirm the current season's exact running weekends and sunflower bloom reports before planning a trip, since both shift year to year.
The Monkey Buffet & King Narai Reign festivals
Two festivals define Lopburi's calendar. The Monkey Buffet Festival falls on the last Sunday of November — 29 November in 2026 — when the Old Town lays out a lavish spread of fruit and vegetables for the macaques at Phra Prang Sam Yot. The King Narai the Great Reign Fair runs each February at Phra Narai Ratchaniwet and around the Old Town; the 38th edition is set for 13–22 February 2026, with a light-and-sound show, khon performances, traditional dress and markets. Always double-check exact dates for the year you're travelling, since both are set annually rather than fixed to the calendar.
Things-to-do questions
What is Lopburi famous for?
Above all its monkeys — the crab-eating macaques of Phra Prang Sam Yot and San Phra Kan, celebrated with the November Monkey Buffet Festival — and King Narai the Great's 17th-century palace, which made Lopburi a second capital. It's also known as Thailand's army town and for the Pa Sak Jolasid dam and cool-season sunflower fields.
Is Lopburi worth visiting?
Yes — it's often done as a quick day trip from Bangkok or Ayutthaya, but the concentration of Khmer and Ayutthaya-era monuments in a compact, walkable Old Town, plus the monkeys, the dam and the sunflowers, rewards a proper visit and even an overnight stay.
When can you see the sunflowers near Lopburi?
The sunflower fields around Phatthana Nikhom and the Pa Sak dam typically bloom in the cool season, with December usually cited as peak. Exact timing shifts year to year with the rains, so check current bloom reports before travelling — and the seasonal SRT floating-train service across the dam runs in roughly the same November–December window.
Are the Lopburi monkeys safe to be around?
They're wild macaques, so treat them with respect: don't carry visible food or drinks, secure bags, and keep hold of phones, glasses and hats. Most encounters around Phra Prang Sam Yot and San Phra Kan are fine if you're sensible, but they are bold and quick.
How much does it cost to visit Lopburi's main historic sites?
Budget lightly: Phra Prang Sam Yot is about 50 baht for foreign visitors, San Phra Kan is free (donation welcome), and King Narai's Palace/Somdet Phra Narai National Museum runs roughly 150 baht for foreigners — a ticket that's reported to also cover Ban Wichayen and Wat Phra Si Rattana Mahathat. Confirm current pricing and exactly what each ticket covers at the gate, as Fine Arts Department sites occasionally adjust combined-ticket rules.
When are the Monkey Buffet Festival and King Narai Reign Fair in 2026?
The Monkey Buffet Festival is set for Sunday 29 November 2026, always the last Sunday of the month. The 38th King Narai the Great Reign Fair runs 13–22 February 2026 at Phra Narai Ratchaniwet and the surrounding Old Town.
Sources & References
- Lopburi province — Wikipedia
- Phra Prang Sam Yot — Wikipedia
- Pa Sak Jolasid Dam — Wikipedia
- Phra Prang Sam Yot — Thailand Tourism Directory
- Somdet Phra Narai National Museum — Thailand Tourism Directory
- San Phra Kan (Kala Shrine) — Travelfish
- Weekend floating-train trips to Pa Sak Jolasid Dam — TAT Newsroom
- 38th King Narai the Great Reign Festival 2026 — Thailand.go.th
- King Narai the Great Fair 38th 2026 — Tourism Authority of Thailand
- Tourism Authority of Thailand
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.
Hero photo by Quang Nguyen Vinh on Pexels. Confirm opening hours and access, especially for the seasonal sunflowers and dam train, before travelling.
