The Achi monastery is a single-nave hall church, built of hewn stone. Constructed at the end of the 13th century or in the early 14th, it was later reroofed, renovated and surrounded by a defensive wall. The whole interior is frescoed. Some murals, stylistically dated to the late 13th century and betraying affinities with the Palaeologan art, are iconographic rarities, such as those depicting the life of Saint George.
The Achi monastery was favored by the Princes of Guria, especially Simon I Gurieli and Kaikhosro I Gurieli in the 17th century. Both made significant donations to the church and Kaikhosro made it a metochion of the bishopric see of Shemokmedi. The abbotship of Achi was then hereditary in the Salukvadze-Taqaishvili family. The church housed a gilded silver cross with a Georgian inscription mentioning the queen Tamar, which was discovered by Ekvtime Taqaishvili. The item was preserved in the Salukvadze family during the Soviet period and returned to the Achi church in 2015.
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Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.