Wat Phra Mahathat Woramahawihan is the most important temple in the province of Nakhon Si Thammarat, and in southern Thailand. The Chedi contains a relic of the Buddha. The temple was first constructed in the 6th or 8th centuries as a much smaller edifice, in the Srivijaya style. At this time this region of what is now Thailand was part of the Srivijaya Empire, however, it is possible that an earlier religious construction existed at this location. Since then the Chedi has been enlarged and re-modelled, with a continual series of additions to the temple grounds. In 1227 it was re-designed in the Sri Lankan style and a temple was constructed around the Chedi. The most recent renovation was completed in 2009.
The 78m high Chedi is surrounded by 173 smaller chedi. These are the final resting places of prominent citizens of the surrounding area over the centuries. The Chedi is approached through a gallery, resplendent with Buddhist images and iconography. There are also several large Wat buildings and a cloister surrounding the temple.
The Chedi is the symbol of the Nakhon Si Thammarat province, and is the centrepiece of the provincial seal. The temple is within the city limits of Nakhon Si, easily reached on foot or public transportation.
The current Thai 25 satang coin dates from 2008, but the coin was originally circulated in 1986, however, few people have ever seen one. The coin is 1/4 of a baht, and a single baht is equivalent of us3c. In every day life one baht is the smallest coin in usage, however, that being said, the coin is still officially in circulation. On the reverse is a rendering of the Wat Phra Mahathat Woramahawihan.
Information largely from wikipedia.
The Chedi is depicted on the reverse of the 25 satang coin.