This site is designated as Korean Natural Monument #417 (link).
This is a very scenic place were a river made a small pond where it was blocked by a limestone rock. Over the millennium, the limestone eroded into a hole. The river now flows through a hole that it bored itself over time down to a calm reflective pool.
Its a nice place to stretch your legs and get some fresh air. It is free to visit and only takes as much time to visit as you wish to spend. There is a small walking path that crosses a bridge, goes up and over the river on the back side and then crosses again on a second foot bridge.
The north east mountains of Korea are some of the most beautiful on the peninsula. The geology in this area also make it a prime location for caves.
The Hwanseongul Cave is one such monstrous cave. Only about 50% of the cave is open to the public with a lit boardwalk and stairs in side. The current path open to the public is approximately 1.6km in length. Taking your time, it could take you 1.5 hours to walk the entire circuit.
From the parking lot, there are a few different caves to choose from, but this is the most popular. Unfortunately, it also requires the longest walk up the mountainside path. From the parking lot, you must walk approximately 1.5 km uphill to the entrance of the cave.
So the old myth goes that a fair maiden who was sexually unsatisfied by her fisherman boyfriend decided to swim out to his boat to get some attention.
Unfortunately due to the storm and seas, they passed without seeing each other. Ultimately she drowned. Upon her last breaths, being bitter to pass this world unfulfilled, she took her frustrations out by cursing the fish.
With that, every fisherman felt the sting of a reduced catch. Until one day, a fisherman turned to the rail of his boat, faced the water and "relieved" himself... The catch of the day improved.
Taking this as a sign, the test was performed again and again. Each time, the catch continued to improve. Soon the entire town came to uphold and honor the phallus as a good luck idol that brought food to their tables.
Statues, carvings and everything phallic that can be imagined came to this little town on prominent display. However some conservative Christians were influential enough to get these relics moved out of the town and into a more secluded park area.
To get here, travel south from Samchok. It is just under 1/2 way to Ulchin. The signs may not be very large, so keep your eyes open. This is also immediately next to the "Samchok Fishing Village Folk Museum"