The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

This handsome giant is said to mark the birthplace of the mythical woodsman and even had a cameo in a Stephen King novel.

This replica of the Greek structure is in the heart of Nashville.

The secret city built by the Manhattan Project.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

A New England curiosity cabinet, one hundred years on.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

Perched on a spindly rock spire in a Greek archipelago, this lighthouse would make a perfect wizard's tower.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

One street divides a single town that stands in two U.S. states.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A geological bull's-eye visible from outer space.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

Single runway interrupted by a busy road that cuts across its middle.

One of the deepest blue holes in the world.

A massive underwater sinkhole made famous by Jacques Cousteau.

On Japan's Tashirojima Island, cats are king.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

Site of the largest volcanic eruption in the last 25 million years, one which may have nearly wiped out humanity altogether.

Deadliest lake in the world suffocated over 1,746 people in one night.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.