Garni Temple is the only preserved pagan temple in Armenia. It is a Classical Hellenistic temple built in the 1st century AD, and it stands on a hill overlooking a river.
Geghard Monastery is a UNESCO World Heritage site and is carved out of a mountain. It contains a number of chapels and tombs, some of which are cut into the rock.
Ejmiatsin Cathedral is the mother church of the Armenian Apostolic Church and is considered one of the oldest cathedrals in the world. It is the seat of the Catholicos of All Armenians, the leader of the Armenian Church.
Tsitsernakaberd is a memorial to the Armenian Genocide that occurred in the early 20th century. The museum contains exhibits related to the genocide, and the memorial is a solemn reminder of the tragedy that occurred.
If you're not renting a car, there are frequent buses and taxis available throughout Armenia. However, it might be more worthwhile to book a tour to see these locations. The driver or guide will be able to provide more information and can ensure that you get to each location in a timely manner. A tour can cost between AMD 10,000 to AMD 20,000 depending on the company and your negotiation skills for the day.
If you have more time, consider adding a visit to Khor Virap Monastery or Lake Sevan. If you have less time, skip Garni Temple as it is the furthest location and can be skipped if needed.
Zvartnots International Airport (EVN) is located 12 km west of Yerevan, and has flights to destinations in Europe and the Middle East. It is the main airport in Armenia and operates 24/7. The airport is accessible by taxi or shuttle bus and costs between AMD 2,000 to AMD 5,000 to get to Yerevan.