A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Take a stroll through this centuries-old tunnel of enormous moss-hung evergreens, nestled among the grounds of America’s first public sculpture garden.

Not only is this nature preserve the largest protected freshwater island on the East Coast, but it’s also a stronghold of Gullah living.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

This ancient walled garden turns fog into food.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

Is this 47.7-mile stretch of highway the longest straight road in the United States?

The first outlet of Canada's biggest fast-food franchise has been slinging doughnuts since 1964.

This groundbreaking 16th-century map is known as "America's birth certificate."

The site of one of the deadliest skirmishes during the Battle of Fredricksburg.

The best way to get a sneak peek at the movies.

This large, circular tomb is the final resting place of the first emperor of Rome.

The world's largest model of our planetary system.

This tower was once used to create ammunition for early settlers.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.