Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

One of New Jersey's oldest surviving buildings still bears the mark of our former British overlords.

Series of storm drains connected to a dark urban legend.

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

A unique sculpture park that specializes in the huge and bizarre.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

Seven people are buried in the middle of what's now a movie theater parking lot.

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

This seasonal soft serve shack has been doling out silky swirls since 1951.

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

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

An old dining hall now serves up ghost stories for lusty locals.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A line of blue paint marks the route of the inaugural parade.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.