Lookout Mountain is full of bragging rights experiences. People may not believe you when you tell them you took an elevator 26 stories below ground then walked deep into a cave past stalagmites, stalactites, and drapery formations to see the largest and deepest underground commercial waterfall in the United States, Ruby Falls. Above ground, it’s ok if you scream while your heart’s pumping on the Ruby Falls’ High Point ZIP Adventure as you glide along 700 feet of ziplines or conquer the 40-foot climbing tower. Done.