From The Athletic:Ranking all NFL stadiums.

6. GEHA Field at Arrowhead Stadium

Team: Kansas City Chiefs

Seating capacity: 76,416

Google review: 4.7 stars

It would be tough to find a better game-day atmosphere. The tailgating scene is outstanding and the crowd noise during games is among the best in the league. The venue has aged well considering the Chiefs have been playing there since 1972.
Superbowl effect. Arrowhead is a pit. Notice it's all atmosphere. Crowd noise? Please. How many SBs have been played in KC? Zero, for a reason...