This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

The oldest continuously occupied public building in the United States.

This giant pocket watch is the third iteration of a local landmark that has been standing just off the Santa Fe Plaza for over 100 years.

The home of famed war correspondent Ernie Pyle is now a library and museum dedicated to his memory.

It's easy to see why this eclectic architectural wonder has been dubbed the "Spaceship House."

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

Artifacts from a battleship sunk at Pearl Harbor displayed in the Capitol building of its namesake.

A geological mystery on Camelback Mountain.

A towering bronze statue memorializes the founding father of postwar American conservatism.

Founded by members of the Tohono O’odham Nation, this one-room joint's James Beard–winning fry bread is light as a cloud.

A mysterious "wedding cake" castle in the middle of the urban desert.

The unusual burial monument of Arizona's first governor.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

Take a monster truck tour around an ostrich farm in the middle of the desert.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

The National Park Service’s best-kept secret with views that rival any in D.C.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

Baltimore's first skyscraper may be home to the inspiration behind pulp fiction's most celebrated bird.

Once America's tallest structure, now a Baltimore landmark.