Ancient Siam is a museum park constructed by Lek Viriyaphant and occupying over 200 acres in the shape of Thailand. Ancient Siam is dubbed as the world's largest outdoor museum. Close to the Crocodile Farm in Samut Prakan Province, the 320-hectare "city" features 116 structures of Thailand's famous monuments and architectural attracti…Ancient Siam is a museum park constructed by Lek Viriyaphant and occupying over 200 acres in the shape of Thailand. Ancient Siam is dubbed as the world's largest outdoor museum. Close to the Crocodile Farm in Samut Prakan Province, the 320-hectare "city" features 116 structures of Thailand's famous monuments and architectural attractions. The grounds of Ancient Siam correspond roughly to the shape of the kingdom, with the monuments lying at their correct places geographically. Some of the buildings are life-size replicas of existing or former sites, while others are scaled down. Still others are "creative designs," and not replicas of any historical structure.