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

The site of Paul Revere's historic two lantern warning.

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

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

Two thousand artifacts from around the world collected by one woman who loved to travel.

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

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

Catch a scenic view of Warsaw's Old Town from the top of a centuries-old dumping ground.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

Atop this library is one of the most beautiful green spaces in Warsaw.

A statue honors the children who fought Nazis in Poland.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Home to three historic ships from the age of Vikings.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

The pockmarks across the building's facade are remnants of the Blitz.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

A naturally mummified 2,000-year-old man.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.