A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

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

Ecuador's largest Incan ruins show evidence of sophisticated irrigation and diplomacy among the ancient builders.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

An Inca spa, military outpost or maybe… both?

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

Ozymandias’ time-keeping temple.

The largest known Ancient Egyptian obelisk.

This 7th-century monastery was sacked by Saladin.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This was once the center of the Birdman cult, and is now a World Heritage Site.

The largest stone moai on Rapa Nui.

The world's most remote airport.

The ominously named cave is home to some remarkable ancient art.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

A tiny nondenominational church harkens back to the days of the first homesteaders in the region.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.