Western Museum of Mining and Industry

The Western Museum of Mining & Industry is a museum. There is a Labyrinth entrance under it. The entrance was destroyed (as well as the other entrances and the Labyrinth itself) after Nico took Daedalus' spirit out of his automaton body.

The Battle of the Labyrinth
In The Battle of the Labyrinth, Rachel spots an entrance to the Labyrinth while being driven around the area. Percy, Annabeth, Nico, and her go in.