An optical illusion found amid a logged redwood forest.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

See massive fossils that are over 200 million years old in northeastern Arizona.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

The ancient tomb acts as a calendar that keeps perfect time.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

Limestone caves with spectacular showcase chambers.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

While it is not equipped to peer into outer space this observatory looks like it was built on the moon.

A beautiful 62-acre Catholic shrine and botanical garden.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Historical trolley restoration and operation at History San Jose, Kelly Park.