The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

Lone survivor from Custer's Last Stand forever preserved.

This Italianate Villa-style castle is pretty to look at, just keep off the private property.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

Community bookshelf of 25-foot-tall book spines.

This giant green head remembers one of America's jazz giants.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

1513 Turkish world map, full of European state secrets and snarky commentary.

A marvel of Byzantine engineering under the streets of Istanbul.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.