Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

This park contains a number of standing stones meant to heal and inspire.

The world's tallest box hedge is found in a delightful garden.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

The ruins of a medieval monastery named after a type of tree.

The ancient tomb acts as a calendar that keeps perfect time.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The highest point in Washington state is a volcano covered in glaciers.

A vertically floating hemlock controls the waves and weather at Crater Lake.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

A massive sea stack famous for its appearance in The Goonies.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

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

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The mounds at this site were reconstructed with the help of archaeologists and historians.

Rare recess caves fill this unbelievably beautiful Ohio park.

The largest earthwork effigy in the world.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

Conveniently located within binocular range of a nuclear bunker, the "summer camp" area was a painfully obvious spy house.