The remnants of this Douglas fir predate Columbus's arrival in North America.

A hidden gem in the middle of the city's infamous Jewelry Quarter.

A museum packed with instruments, lyrics, and other mementos of the American folk icon.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

This Nigerian nature reserve is home to the longest canopy walkway in Africa.

The former home of the world-famous Templeton Carpet Factory.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.