A beautiful geyser under environmental threat.

Almost half-way between the Equator and North Pole.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

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

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.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

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

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

Prehistoric animals decorate this popular outdoor park.

The world's longest known cave system.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

This 19th-century building inadvertently preserved the handprints of its builders within its walls.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

A unique collection of diving equipment spanning antiquity to the present day.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

A monument celebrating the idea of reaching inaccessible places.