No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

All that remains of a gigantic earth-moving machine.

Ohio's 19th-century communist micro-society.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

The world's first aircraft factory has been hiding inside an automobile plant for almost 80 years.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

The spectacular collection of one of the world's best woodcarvers.

The largest ancient burial mound in Ohio.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

The largest earthwork effigy in the world.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

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

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

A downtown park built on top of unclaimed graves.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Even in death, he's still your huckleberry.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.