A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

A museum within a museum, devoted to history's most questionable medical devices.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

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

Guns that have been defending San Francisco since 1904.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

Once a private collection, now the only museum of arms and armor in the Western Hemisphere - CLOSED.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

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

Soaring over the Niagara Whirlpool since 1916.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

The yawning maw of this pagan visage is said to bite off the hands of liars.

Concrete strongholds stand guard over the Golden Gate.

Golden Gate Park's historic collection of plants.

The only arched bridge made of stone on the entire Mississippi River.

Quite simply the largest tree in the world (by volume).

This small-town library was the first in the world to be entirely supported by taxation.

This mural celebrates the early integration of a New Hampshire baseball team.

Beautiful natural falls where Satan once ruined a pot of beans.

The final resting place of a suffragist author.