Tiny treasures, giant murals, and strange sculptures decorate the windows and doors of this abandoned building.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

One of the first intercontinental ballistic missile sites in the United States.

Calidum et Deliciose Succosum!

This incongruous small ferry across the Willamette River north of Salem, Oregon has been operating continuously since the 1850s.

See Hoover Dam and the bypass bridge from a perspective usually off-limits to the public, and float the upper part of the Black Canyon National Water Trail.