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

An overlooked memorial honoring the local Washington residents who died in World War I.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

This lighthouse was witness to the end of WWII hostilities and now collects creepy cairns.

Off a hiking trail in Rhode Island stands a picturesque memorial to a long-forgotten war.

Abandoned Coast Artillery fort now serves as graffiti canvas and sightseeing vantage point.

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

Largest man-made excavation on earth!

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Only known mainland rookery of the threatened Stellar sea lion.

Concrete strongholds stand guard over the Golden Gate.

An old whaling station now serves to give the public a look at the commercial whaling industry, no longer a part of Monterey's economy.

The first safe in this California town had to hold all the gold.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

Haunting and beautiful trees, doomed to die.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

A house carved into a rock in the 1940s.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

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

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.