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

A downtown park built on top of unclaimed graves.

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

Colorado's only true geyser is hidden within the San Juan National Forest.

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.

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

This super steep hike ascends 2,000 feet in less than a mile.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

This spectacular track has run continuously since 1882.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

When ecosystems collide in the arid Southwest.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

The largest self-built castle in the U.S., six decades in the making.

This naturally-sourced hot spring is now home to a clothing-optional resort.

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

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

Every January 6, young men dive into Spring Bayou in search of a cross and a year's worth of maritime blessings.

The strip club's VIP lounge is actually a rare repurposed Futuro House.

This video store is a horror buff's dream.

The "worst battleship ever built" is enjoying a grand second act, submerged 30 feet in the Gulf of Mexico.

One of the best places in Florida to spot rare, carnivorous pitcher plants.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.