The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The sunlight passing through the opening of this huge cave system creates a magical effect.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

Three hundred years of preserved Spanish colonial history in San Antonio.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A tree bears footwear on the loneliest road in America.