A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A museum devoted entirely to the rattlesnakes and snake-related art.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Two plaques commemorate the site of Shakespeare's first theatre.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Three prestigious academic collections come together to create a world-class natural history museum.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

An enormous, inside-out glass globe built in 1935.

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

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

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

The Boston square dedicated to the dark poet who was born nearby.

A men’s restroom became a sandwich shop.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

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

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.