The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The Habsburgs' royal collections of art and wonders.

The final resting place for the remains of 143 Habsburg royalty.

Berlin's old airport.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The most visited, and possibly most controversial, museum in Germany.

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

The world's largest piece of copyrighted artwork.

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

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

One of the indelible moments of the American Revolution took place at this location.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

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

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Historic Hull Street was actually the first street with a proper name in the Boston area.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Statue commemorating the use of ether in anesthesia.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

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

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

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

One woman’s obsession gave birth to this lovely oddity at the Boston Public Library.

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

Painstakingly built dioramas sit unnoticed in a Boston office building.