This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

This geothermal hot spring hides beneath a slowly growing mineral dome.

The world's longest known cave system.

A heavenly experience, right here on Terra Firma.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A museum dedicated to the history and exploration of both popular music and science fiction.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

A walk through the historic city center, under the streets of Seattle.

A giant Troll lurks under one of Seattle's oldest bridges.

An enormous, inside-out glass globe built in 1935.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

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

A magnificent, reportedly haunted mansion built for a composer by Spiritualists.

North America's largest accredited model railroad museum.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A massive cave once a secret military base is now home to thousands of bats.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

An homage to the medieval rulers of Bulgaria.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.