America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

The former locus of Boston's high culture has been shuttered and buried for over 70 years.

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

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

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

Dim sum, served in a grand old theater.

A half-size replica of the World Trade Center towers above Tulsa.

Circus cemetery for all the “showmen under God’s big top.”

An acoustic anomaly with a mysterious cause.

Hidden behind a YMCA stands the remains of a ceremonial site that dates back hundreds of years, whose ground is still considered sacred to many Hawaiians.

Hawai'i's oldest wooden house was shipped around Cape Horn from Boston in 1820.

A unique collection of Western and Japanese-style graves.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

Hiding in plane sight.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

A hulking remnant of Alaska's industrial gold mining boom in the 1920s.

The first Russian Orthodox church in North America and an Alaskan landmark.

This gravelly, dangerous highway is the only road in the United States that leads to the Arctic Ocean.

This super-sized statue is the only public memorial to the deal that ended America's neutrality during World War II.

Impressive artifacts from Juneau's gold mining days fill this mining site-turned-museum.

Known as the “Official Greeter of Juneau,” this dog still welcomes ships and their passengers to Alaska.

Colorful boxes placed over the dead are left to rot and crumble.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.