Just south of the capital Seoul is the city of Suwon, hometown of Park Ji-Sung and the Suwon Bluewings, but also the UNESCO World Heritage site the Hwaseong Fortress. The fortress was built in between 1794-1796 by King Jeongjo of the Joseon Dynasty to honor and house the remains of his father Prince Sado. The site contains 4 gates as well as 5.74 km (3.57 miles) of wall. The most famous gate is the South Gate 팔달문 which is surrounded by a large market as well as a number of other businesses. The fortress has ongoing reconstruction since the 1970’s.
My Opinion
It is a great place to visit if you enjoy history, and walking as much of the fortress is spread around the site plus the wall itself is as mentioned before over 3 and a half miles long. The one thing I do like about the fortress is its more relaxed feel and because of its size the fellow tourists are spread around the site and so you have space to breathe and time to take a photo without somebody walking in front of you. Top Tip: take a picnic and sit at the top of the fortress and enjoy your sandwiches whilst looking over the whole of Suwon.
How to get to Hwaseong Fortress
It is easiest way to visit the fortress is by bus, you can take the 2, 7, 7-2, 8, or 13 from outside Suwon Station, there are also many buses which past the fortress from Seoul and other places in Korea. Paste this address “329 Jangan-dong, Paldal-gu, Suwon-si, Gyeonggi-do, South Korea” into GoogleMaps and you should be able to find the best way for you.
More Information:
* Wikipedia Entry (Very Detailed)
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Sujeong Modern Seoul
Modern Seoul 
Suwon is definitely a place one must visit in Korea. Good read.