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

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

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

Eccentric concrete mansion and museum designed and built by hand from the inside out.

The competition: breathe deeply as long as you can.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

The only arched bridge made of stone on the entire Mississippi River.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

A semi-scholarly approach to sex.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A whimsical monument deep in this park commemorates the groups that helped build it.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

137 graves holding New England's earliest residents.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

This landmark cemetery in Boston was created more than 300 years ago.

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

The "lovely red Vega" of the legendary record-settling pilot.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A unique geological area spiked with wind-carved rocks that resemble teepees.