America's only nuclear missile silo open to the public.

This church on a Tohono O'Odham reservation has stood since 1797.

The abandoned train depot now doubles as a well-placed rest stop for those who take the road less traveled.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

A striking memorial to the 21 lives lost in an explosion at the Washington Arsenal

The privately owned cemetery that holds room for Washington's finest when they step down from life.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

A Prada store in the West Texas desert that is never open for business.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

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

Life-size bronzes of the Grinch, Cat in the Hat, Yertle the Turtle, Sam-I-Am, and the Lorax—and the author himself.

The largest collection of historic military firearms in the United States.

The site of the first "historically true" UFO encounter in the U.S.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

One of the oldest living oak trees in the Southeast.

Three hundred years of preserved Spanish colonial history in San Antonio.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.