The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

San Francisco's newly reopened hands-on science museum.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

It took 275 years and four burials to finally put the Mayflower’s most famous passenger to rest.

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

Statue commemorating the use of ether in anesthesia.

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

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

A men’s restroom became a sandwich shop.

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

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

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

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

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

The building that inspired Shirley Jackson's "The Haunting of Hill House."

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

The most confusing clock in New York.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

Monument to a forgotten NYC disaster that claimed the lives of 1,000.

A reminder to choose water over wine since 1888.