On Thursday, the Frozen star, 42, shared a series of photos on Instagram from her family's trip to Mount Rushmore in South Dakota. The photos feature a rare glimpse at Bell and Shepard's daughters ...

Sculptor Gutzon Borglum began carving the images of four U.S. presidents into Mount Rushmore on Oct. 4, 1927. The effort employed 400 people and took 14 years to complete.