The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

A cemetery housing wild west legends in South Dakota.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

Two creeks flow out of either end of this canyon in opposite directions.

A coal fire has been burning underground here since 1896.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

The remains of an early 1900s dude ranch that operated until the 1970s.

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

Hidden high on a remote mountain peak is a humbling and mysterious Vietnam War memorial.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

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

Climb to the top of this spiritual tower, and you'll be rewarded with spectacular views.

This interpretive path lets you get up close and personal with dinosaur bones.

A fake mine that was made using real mining techniques which is also used as a community center.

There are eight natural springs around town, each with a slightly different taste.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.