These markers are used to determine the ground stability of the Strip.

A new monument to an old grave that was uncovered during the rebuilding of a California ghost town.

The last remaining 19th-century mile marker along the historic Ocean Parkway.

The drawbridge used in the filming of the movie 'Annie' has been in the open position as it was in the movie for decades.

A dedication plaque on this Boston tunnel is a microcosm of a massive, controversy-laden construction project.

What once housed a private club catering to Comstock Lode elite is now considered one of the West’s most haunted spaces.

A war memorial that appears to ascend from its forested setting.

Money may not grow on trees, but it can be dispensed by one.

America's first National Historic Landmark is a 100-foot tall obelisk and gravesite dedicated to the only casualty of the Lewis & Clark Expedition.

Circleville is seriously smitten with this giant gourd.

Abandoned blast furnaces are an enduring reminder of Scranton's once booming iron business.

Colorful outcrops and cliffs just north of Reno provide a scenic backdrop for hiking and mountain biking.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

A natural dome made of volcanic glass in Inyo National Forest.

For decades, the largest tungsten producer in the U.S. was located in a spectacular setting in the high Sierra Nevada, with some of the workings over 11,000 feet.

An iron monument on the 120th meridian as surveyed, one of only four marking the boundary between Nevada and California north of Lake Tahoe.

This sound-art installation features songs composed using only the Mid-Hudson Bridge as an instrument.

Visit a remnant California's Gold Rush, which locals claim is haunted by spirits from the past.

This huge clock made of flowers and simple machinery was once used a political weapon.

The 34th governor of Kentucky was sworn into office while on his deathbed after being shot outside the State House.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.