1. Chaukhandi Stupa, located in Sarnath near Varanasi, is a historical Buddhist stupa believed to be built in the 5th century to commemorate the visit of Lord Buddha to Sarnath. The stupa is known for its unique octagonal shape, which is different from the more common circular or square stupas found in India.

2. Chaukhandi Stupa is an open site, and there are no specific working hours. Visitors can access the stupa throughout the day. However, it is recommended to visit during daylight hours for a better experience. Unfortunately, there is no phone number available for the stupa.

3. There is no entry fee to visit Chaukhandi Stupa. To reach the stupa, visitors can either hire a private cab or take a rickshaw from Varanasi. Sarnath, where the stupa is located, is situated about 13 kilometers from Varanasi, and it takes around 30-40 minutes to reach by road.