A musical instrument played by the sea.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

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

A mysterious stone embedded at the base of a historic Boston building.

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.

A toy store with a century-long history preserves the craftsmanship of playthings of the past.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Giant, friendly pelicans in Central London, the most unlikely of places.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Hidden in plain sight, this creepy sculpture watches from above.

This enchanting Victorian estate was home to the world's first hydroelectric power generator.

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

The greatest real estate coup of all time.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Cryptic messages embedded in the New York City sidewalk.

The site of the climactic scene from the classic horror film is now a historic landmark.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Museum dedicated to wax representations of disfiguring diseases.

This former insane asylum now holds a pathological anatomy museum.

The Habsburgs' royal collections of art and wonders.

Op-art architecture designed for happiness.

Baroque celebration of the end of the Great Plague of Vienna.

Legends surround an ancient tree trunk riddled with nails for good luck.