From the passage provided, extract the cost of the Ryman Auditorium's most recent renovation and expansion.

Context: In 2015, the Ryman underwent another US$14,000,000 renovation and expansion. Much of the 1994 expansion was gutted and remodeled. The original building received only minor touch-ups and remained in use throughout the construction. The renovation and expansion includes more lobby space, plus expanded restrooms, concessions, and a gift shop. A new quick-service restaurant was added, called "Cafe Lula" and named in memory of Lula C. Naff. New renovations in 2023 will include a new gift shop in the previous Café Lula location. 

Also added in the 2015 renovations was a 100-seat theater. Here a short holographic film is shown that serves as the first exhibit on the building's daily self-guided tours. Entitled The Soul Of Nashville, the film features an actress portraying Naff in presenting the history of the Ryman. It also features an original song performed by Darius Rucker, Sheryl Crow, Vince Gill, and the Fisk Jubilee Singers.

Answer: In 2015, the Ryman underwent another US$14,000,000 (equivalent to $16,004,773 in 2021) renovation and expansion.