Barra Honda National Park is located about 30 minutes east of the town of Nicoya in Guanacaste. It is one of the most unique national parks in Costa Rica and it's popularity is quite small. Not because it is a non-attractive site, but rather that few travelers know about it. What's worse very few locals know about it. They may have heard of it, but haven't really placed much importance to it. Some don't even realize that there is an intricate cave system located there. Venado Caves on the other hand is well known and for many years, tourist agencies have been taking travelers to this site. So this is a great idea for those travelers that like to experience something different to most adventurers.
Barra Honda looks pretty much like a hill that is roughly 300 meters above the Tempisque Valley and 450 meters above sea level. Many locals thought the hill to be a volcano due to a guano smell which they confused for sulfur. This guano is due to the colony of 5,000 bats that live within the caves. Only 19 of the 42 caves found at Barra Honda have been explored. The cave entrance was discovered in the late 1960's, yet human remains have been found 30 meters deep as well a Pre-Columbian artifacts. The base of the cave is coral reef dating as far as 60 million years ago.
Barra Honda by far is definitely an interesting site to visit and in a sense the fact that it has been a bit of a kept secret making it all the more mysterious.