At 207 feet, one of the world's longest continuous escalators.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

American involvement in World War I officially ended in 1921 in New Jersey, three years late and thousands of miles from the battlefield.

Where the embers of the Big Bang were first detected.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

World War II bunker still standing on the New Jersey beach.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

An architectural oddity hides in plain sight on this iconic London bridge.

This road earned its macabre nickname after hundreds of Iraqi troops died along it in 1991.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

Creating this diorama spurred naturalist Carl Akeley to begin advocating to protect the apes.

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

This kitschy tavern is also home to rare early editions of "Treasure Island."

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

Ecuador’s historic seat of government has been quietly looted in recent decades, and no one knows how or by whom.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.