A tunnel with windows, so you don't miss out on the impressive views.

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.

This rustic old building is said to be the most photographed barn in America.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

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

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

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

This museum houses two of Mexico's most impressive Aztec monoliths.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

A bronze statue of the famed Prussian naturalist commemorates the year he spent in Mexico.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

A fabulously bizarre surrealist sculpture by the late artist Leonora Carrington.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

The only castle in North America to ever house European sovereigns.

Dedicated to the victims of one of the deadliest hurricanes to strike the United States in recorded history.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.