Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

Ancient pueblos built into the base of a natural canyon wall.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

A stealthy Apache hideaway that became the haunting site of a mass grave.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

A reproduction of earth's many biomes.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Thousands of years ago, Indigenous people painted images onto these canyon walls that are still on display today, provocative, mysterious, and enduring reminders of the people who lived here long ago.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

This quiet chapel was central to a community of settlers who reclaimed an abandoned fort.

This church on a Tohono O'Odham reservation has stood since 1797.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.