Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

The geoglyph once sported a glass bottle eye.

These experimental weapons brought World War II to Nebraska as well as 26 other U.S. states.

A brick-paved former section of the historic coast-to-coast highway.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

A mysterious ancient network of thousands of perfectly straight lines stretching across miles of Bolivian desert.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

This lesser-known geographic marker was the reference point for all surveys of the continent for 75 years.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

This road winds through the steep coastal cliffside offering spectacular views for those who brave the drive.

The largest earthwork effigy in the world.

The largest ancient burial mound in Ohio.

A castle built by an eccentric medieval enthusiast in rural Ohio.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

A marvel of Byzantine engineering under the streets of Istanbul.

Twenty-year effort to raise a castle using tools and techniques from the 13th century is now abandoned in the Arkansas woods.

This famed Silk Road oasis was one of the largest cities in the world before it was destroyed by a Mongol horde.

Georgia's highest point was given its strange name thanks to a simple translation error.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

Step back in time on this preserved 1800s farm.