Vihara Gunung Timur, a Taoist temple, is the oldest temple in Medan. It is located at Jalan Hang Tuah, and overlooks the Babura River.
Despite being an old temple, it is well taken care of. Not a huge temple, but still worth a visit when you are in Medan. If you wish to worship or pray when you are in the temple, incense sticks are available at a small donation for the upkeep of the temple. Amount of donation is really up to you.