An amazing example of early-20th-century architecture, this church features marble transported from Utah.

Look closely and you’ll notice that the color changes a third of the way up the tower.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A nostalgic bibliographic gem.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The famous aviator's final resting place is a study in natural beauty.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A cemetery housing wild west legends in South Dakota.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The only road through the heart of Glacier National Park.

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

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

An architect's childhood fantasy treehouse made real.

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

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

This supermarket is suspended 25 feet above an interstate highway.

One of the indelible moments of the American Revolution took place at this location.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.