Veherakanda - Kotte, Sri Lanka

The Veherakanda archeological site consists of a rectangular platform with two buildings shaped like stupas. These are said to be the tombs of Parakramabahu IV and his wife. However, there isn't much information on the site and this could be wrong. The base of the platform, the base of the bigger tomb/stupa and the smaller tomb/stupa are built out of laterite. The ruins are about a 20 minute drive form Colombo.

Abhayagiriya Complex - Anuradhapura, Sri Lanka

A section of the Abhayagiriya monastery which once housed over 5000 monks. The monastery complex has a number of interesting sites including the "buth oruwa", the Elephant's pond, a moonstone and the Samadhi Buddha statue. It is spread out over a large extent of land and quite often, you have the place to yourself. 

Kaludiya Pokuna - Anuradhapura, Sri Lanka

Most travellers tend to go up to the main Mihintale temple but don't bother visiting the other ruins in the complex. The Kaludiya pokuna is definitely worth a visit as it contains a small stupa and the ruins of an ancient monastery. Pictured above is a cave dwelling near the pond. Monks still meditate in the jungles surrounding this area.