This massive home was constructed by one of the greatest conservationists in Colorado history.

In a dry, neglected cemetery lies the unassuming grave of a soldier vilified in life but celebrated in death.

An innovative local park built from an abandoned sewage treatment plant.

This Chinese-style quartz sundial was saved in its final hour.

In a small Japanese garden off a busy Denver street, a memorial to a brave, principled politician.

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

A beautiful final resting place for some of the noteworthy deceased.

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

The carved remains of a 200-year-old oak tree memorialize the namesake of the iconic "Wizard of Oz" character.

A massive bur oak tree believed to be some 500 years old is the centerpiece of this quiet urban greenspace.

A lively annual event in which thousands of people race to push coffins heavy with bodies up a hill.

A collection of 11 million buttons illustrates the human toll of the Holocaust.

This small piece of railroad history sits behind the parking lot of a chain grocery store.

The largest source of fossilized insects anywhere.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

This statue of an obscure comic strip hero stands as a tribute to patriotic service and a cautionary tale about embracing fads.

This underfoot portrait is the work of a disgruntled painter inspired by a tragic poem.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

The burial grounds of a secret society includes fences topped with fake Tesla balls.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

This sidewalk tribute honors Colorado's great culinary creation.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."