Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

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

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

A Circus legend leaves an unexpected endowment.

In the depths of the Everglades, one man has dedicated his life to studying the elusive Skunk Ape.

The smallest post office in the United States is no bigger than a broom closet.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

An eerie and beautiful group of columns mark the site of a grand mansion lost to time and fire.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Official museum, hall of fame, and repository of the Texas Rangers.

This is one really big nut.

The outcropping is graffitied with the name of the beloved musical Muppet television series.

What is the Thing?

The trials and tribulations of marking Poe's grave.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

Semi-recognized center of the world, with many oddities.

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."