3500 years of Cappadocian cave homes: These unique underground havens once were used by early Christians to hide from Roman armies, yet they remain occupied to this day - 100 square miles with 200+ underground villages and tunnel towns complete with hidden passages, secret rooms and ancient temples, with each new civilization building on the work of the last.
Lamanai (Belize). 'Spanning all phases of ancient Maya civilization, the ruins at Lamanai are known for their stone reliefs, impressive architecture, and their marvelous setting that overlooks the New River Lagoon and is surrounded by some of Northern Belize’s densest jungle. While on site, hear the roar of the howler monkeys while climbing the steep facade of the High Temple and admiring the deformed face on the Mask Temple.' http://www.lonelyplanet.com/belize/northern-belize/lamanai