A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

A time-capsule monument reminding future generations of the importance of efficient and effective use of natural resources.

The final resting place of the most famous outlaw in the Old West.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

The most powerful laboratory radiation source in the world pulses with 1,000 times the electricity of a lightning bolt.