The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

This rock formation named for its unique shape is one of many that call the Alabama Hills home.

The first life claimed by this record-breaking peak wasn't lost to exposure or a fall but rather lightning.

No one's quite sure why there's a metal megaphone bolted on two rocks in the middle of the Mojave Desert.

Abandoned Air Force base that has fallen into disrepair.

Dozens of rockets and missiles are on display outside a testing facility in the Utah desert.

A spectacular overlook of the Little Grand Canyon of the San Rafael River, a deep sandstone gorge streaked with orange, red and white in a remote, uncrowded part of Utah.

The last SR-71 ever constructed.

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.

Where a guard killed nine German prisoners during one of the worst 20th-century POW camp massacres in U.S. history.

A museum in rural Utah documents the history of the Japanese Americans who were forcibly relocated there.

A Mars simulation in the southern Utah desert.

“Live hard, ride fast, eat pizza” at this joint filled with Evel Knievel memorabilia.

World's first "penitentiary," meant to be humane, drove men insane.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

America's first serial killer rests in anonymity.

The collection is exhibited in a Staten Island building modeled on traditional Himalayan architecture.

The second-largest (of only two in the world) large particle collider is the underdog of experimental physics.

A tribute to the hard-working men and women of Grumman, who crafted F-14 fighter jets.

A fire station-turned-church-turned-museum dedicated to the work of seminal light artist Dan Flavin.

A mysterious air force base built to resemble a Long Island fishing village.

A temple belonging to the largest Buddhist order in South Korea nestled in the middle of New York City.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The home of aviation trailblazers, in a remote corner of the big city.