These futuristic concept cars from the 1950s are up for auction with a $20 million estimate

A trio of rarely seen, futuristic concept cars from the 1950s are going up for auction at Sotheby's, with an estimated value of up to $20 million.

These futuristic concept cars from the 1950s are up for auction with a $20 million estimate
A trio of rarely seen, futuristic concept cars from the 1950s are going up for auction at Sotheby's, with an estimated value of up to $20 million.