A US Coast Guard helicopter flies over the Pacific Ocean near Muir Beach, California.
A water tower stands tall over trees in the small North Texas town of Trenton.
The tall masts of the historic ships Balclutha and C.A. Thayer at the San Francisco Maritime National Historic Park.
One Prudential Plaza, Two Prudential Plaza, the Aon Center, Aqua and Blue Cross-Blue Shield Tower stand tall in Downtown Chicago as seen from nearby Grant Park.