This impressive Boston holy house is the American mecca for Christian scientists.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

A giant sculpture head with an optical illusion dedicated to the longtime conductor of the Boston Pops.

The massive machine creates cracking displays of indoor lightning.

Ice cream stand, snack bar, and time capsule of milk conveyance.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

A luxury hotel constructed out of a former jail.

The colonial home of Paul Revere during the American Revolution.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

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

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

Copenhagen's celebrated theme park and gardens.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

This neighborhood was built in the golden age of Art-Decó, and its buildings are essential to understanding this style

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Legend holds eating just one of these black eggs can add seven years to one's life.