This 19th-century zoological collection has withstood the test of time.

The oldest cemetery in Belgium.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

An open-air sewer system that was covered piece-by-piece over 300 years.

This former guildhall with a bacon-like exterior is now home to a museum covering 600 years of Antwerp's musical history.

The Atlantis of Cape Cod reemerges during the lowest of tides.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

A more than 260-year-old crypt built on Boston's oldest English burial ground.

A historic bridge with a lovely acoustic anomaly.

Over 50 whirling pools left behind from the glacial age.

Radical Bookstore and Community Space.

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

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

Museum dedicated to awful artwork.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

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

A beautiful Victorian-era cemetery, complete with a miniature village.

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