Google Map location. You can just make out Muang Boran, which is in the shape of Thailand itself.
Muang Boran is not that easy to get to, although coach tours do operate here and you can catch bus number 511 to the end of the line, followed by number 36. It is to the south-east of Bangkok (Samut Prakarn) and about an hours ride away from the centre along Sukhumvit Road. But if you can afford the time is a worthwhile change of scenery. Muang Boran is basically a collection of scaled down replicas of important monuments and buildings from around Thailand. The park is better visited by car- you can drive around the park or take a tour as it is very big. Bikes can be hired at the entrance.
It is a very interesting day out and gives you a nicely condensed view of Thai architecture. Maybe due to it's location, the park is also very peaceful. If you combine this with the nearby Crocodile Farm it makes a satisfying day out.
Below is just a small selection of photos of the most interesting buildings.
The Ancient City website