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

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

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.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The final resting place of the poets Shelley and Keats.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

An alchemist's “magic door” stands in the middle of a Roman park.

Rome’s legendary peephole vista is also a former Crusader stronghold.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Lie in a hammock where George Washington stood.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

A British plaque explains that a house was built using the spoils of the first international golf bet.

The fountain marks the area where hundreds of accused witches were burned at the stake.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A scattered trail of street art adds a pop of color to the city's stark structures.