The only structure left with direct ties to the Salem witchcraft trials of 1692.

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

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

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

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

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

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.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

Millions of numbers carved in glass represent the tattoos forced upon victims.

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

A centuries-old church stands as a testament to Boston's "father of architecture."

This candy-striped tower is the farthest east you can go in the United States.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

Whitewashed mosque contains the world's largest carpet.

Billed as the "largest natural flower garden in the world" this Middle Eastern show field has little competition at 45 million flowers.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

A monument to one of the few Olympic flames ever to be lit outside of the host city.

A statue honoring 44 continuous years of greeting passing ships.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

Where three rails and three centuries of transportation meet.

This former coal gasification plant found a curious second life as a popular public park.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.