1. Venado Caves, located near La Fortuna in Costa Rica, is a popular tourist destination due to its unique geological formations and underground rivers. The caves were formed about 15 million years ago due to volcanic activity and are believed to be one of the oldest cave systems in Central America. The cave system stretches over 2.5 miles and has narrow passages, stunning stalactites, and stalagmites. Visitors can explore the caves through guided tours that involve rappelling, crawling through tight spaces, and wading through underground streams. Wildlife such as bats, insects, and crabs can also be spotted in the caves.

2. The working time of Venado Caves is from 8:00 am to 4:00 pm daily, and their phone number is +506 2479 8559.

3. The admission fee for Venado Caves varies based on the tour option chosen. The basic tour costs around $45 per person, and the more extensive, adventure tour costs around $115 per person. The entrance fee for children under 12 years of age is around $40. Visitors can arrange transportation to the caves from La Fortuna or San Jose, and taxi service is also available.