David Gareja (Georgian: დავითგარეჯის სამონასტრო კომპლექსი, Davit'garejis samonastro komplek'si, sometimes spelled Davit Gareja) is a rock-hewn Georgian Orthodox monastery complex in the Kakheti region of Georgia.
The monastery lies on the half-desert slopes of Mount Gareja, 60–70 km southeast of Georgia's capital Tbilisi, and is even partially in Azerbaijan.
Although most of the complex is in Georgia, the ridge of the site is in Azerbaijan and completely closed as of 2022, no way to get up. (Even though, the exact border is still the subject of a dispute between these countries.) This kind of defeats the purpose of the whole trip and thus makes it probably not worth it.
The itinerary of the shuttle bus as of Sep 2018:
If you want to continue to Sighnaghi after visiting David Gareja, ask the driver to drop you in Sagarejo. You'll probably be dropped at the intersection of Highway 5 and Street 172 (the one coming south from Udabno). There you could ask around for a taxi. The owner of the little bar next to the "restaurant in a bus" drove us to Sighnaghi for 70 lari (70 km, 50 min).
There are two options to get there: either via Sagarejo (with a road in regular condition), or via Rustavi, which offers an amazing view on the industrial desert of this former factory city, but at the price of a road in a very bad state—when raining probably not manageable in a regular car.
In both cases, make sure you have a good GPS software, as the road signs are almost non-existent (slightly better via Sagarejo).
Three options:
No entrance fees.
Walking is the only option on the site of the monastery.
The main monastery is right behind the small parking lot. You can visit most of it; the rooms not allowed to tourists are clearly marked with "no entrance" signs, in both English and Georgian. See the tomb of the first monk to have lived there (St. David Garejeli).
Then, you can follow the path starting right behind the church shop, that goes on the top of the small mountain. There, you have a wonderful view towards both Georgia and Azerbaijan. And you will see many troglodyte churches, some of them with paintings from the 11th and 12th centuries. Total time: about 1hr 30min, using a sometimes steep path.
Wandering around is the activity of choice.
The church shop at the entrance of the site sells some religious objects.
There are numerous places to eat and drink in Udabno, the town just before the monastery. Or you can just bring your own food.
The monastery is partly in Azerbaijan territory. Generally, the entry is possible without any problems, but sometimes Azeri soldiers might block the way due to the ongoing dispute between the two countries. This might be troublesome, but it does not pose any danger to tourists.
Travelling further is not possible. Travel into Azerbaijan requires a visa and a proper border control.
It's often windy; so during winter be sure to wear warm clothes.
Toilets are available in the building next to the parking lot for 0.50 lari.
Probably the Oasis Club also has WiFi. Out of all mobile carriers Magti has the best reception and 4G internet is available along most of the way and at David Gareja. You can buy a simcard package in Sagarejo or Rustavi.
Also, see Kakheti region for more details.