Peru
Housed in a Lima mansion, this museum focuses on pre-Inca artifacts from all over Peru. It does an excellent job of surveying and explaining pre-Inca cultures.
Ireland
This is an evocative and impressive site. Perched on a 300 foot cliff overlooking the Atlantic ocean, Dún Aonghasa is the largest of the prehistoric stone forts of the Aran Islands. The fort consists of three massive dry-stone walls and a chevaux-de-frise, a dense band of jagged, upright stones, surrounding the fort from cliff to cliff, designed to impede attackers. Originally constructed c.1100BC, it was re-fortified around 700-800 AD.