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

A historic hotel library in Indiana hides more than a few secrets on its shelves.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

It took 160 years to complete the most ornate church in Ecuador.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Quito's historic, main square dates back to the 16th century.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.

The world's tallest aluminum statue is also the world's tallest image of a winged Virgin Mary.

An Inca spa, military outpost or maybe… both?

This towering volcanic plug stands out among the dramatic formations that dot this otherworldly desert valley.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

This hauntingly beautiful cemetery outside a medieval citadel is full of winding paths and ivy-covered graves.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

The building stands within a quiet, postcard-perfect New Mexico village.

These unusual rooms on wheels are holdovers from the 1960s.

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

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