Gremi castle and church is an architectural monument that was built in 1565 by the king of Kakheti Levan. His tomb is located in the castle church. There is also a small museum inside.
The castle is located in the beautiful area and offers scenic views from the tower.
Getting there: First, go to Telavi from the Ortachala bus station in Tbilisi (1.5 km from the Isani metro station). A minibus ($5) runs every 30 minutes , 2-2.5 hours to go. The next minibus is Telavi - Gremi (ask for location of the local bus station, it's somewhere nearby), it runs every 30 minutes and costs $1. Gremi is located 21 km from Telavi, therefore you can take a taxi.