- Who
- Cathedral Caverns
- Where
- United States ()
The entrance to Cathedral Caverns in Grant, Alabama, USA, is the largest cave opening in the world. Measuring 38.4 m (126 ft) wide and 7.6 m (25 ft) high, Cathedral Caverns, which is approximately 1,220 m (4,000 ft) long, was originally known as the Bat Cave until it was developed into a tourist attraction after 1955.
