Khao Loan Castle

Prasat Khao Lon sits on a small sandstone hill in Ta Phraya district, Sa Kaeo province, at the foot of the larger Khao Sakae Krong ridge near the Cambodian border. Despite the English name “Khao Loan Castle,” this isn’t a fortress — it’s an 11th-century Khmer Hindu sanctuary, three brick towers set on a shared sandstone-and-laterite base, built in the Baphuon style during the reign of King Suryavarman I. Inscriptions carved into the doorframes date construction to around 1016 CE.

Walking the site, you’ll find weathered laterite blocks and brick towers arranged north to south, the centre tower taller than the two flanking it, all raised on a lotus-shaped platform. Carved lintels survive on parts of the structure despite a millennium of monsoon rain, and a rectangular reservoir — a baray, built to collect and store water — sits at the base of the hill, evidence of the engineering that supported the sanctuary above. Paths link the tower group to the reservoir; grasses and small trees have taken root between the stones, and there’s rarely another visitor in sight.

Insider Tip: Combine this with a stop at Ta Phraya National Park’s viewpoints on the same road — the park entrance is a short drive further into the district, and its ridgeline lookouts over the Sankamphaeng range are worth the detour.

The site is cared for by Thailand’s Fine Arts Department, which keeps it free to enter, daily from 08:30 to 16:30. There’s no visitor centre or shop, so bring water and sun protection — shade is limited once you’re among the towers.

Watch out: Ta Phraya district sits right against the Cambodian border. Roads are fine for ordinary travel, but this isn’t a place to wander off marked paths after dark.

Getting here means driving: it’s roughly 100 km east of Sa Kaeo town, past the district centre of Ta Phraya, along rural roads with no public transport option. Most visitors combine it with Khao Yak or a stop inside Ta Phraya National Park, both a short drive away in the same district, rather than visiting on its own.