These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

A self-built castle made by a mysterious man.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

One man's quest for the ultimate road trip vehicle.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

This historic tower in the California desert promises visitors a "vortex of good vibes".

These ancient sacred grounds granted amnesty to those who managed to reach them.

A tunnel of hardened lava along Maui’s famous Road to Hana.

Race through the maze, get your name on the sign.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This blowhole is supposedly caused by a trapped monster.