These markers are used to document elevation changes around the famed dam.

100-year-old shipwreck you can walk up to at low tide.

Home of Jake the Alligator Man, the mummified remains of a cigar smoking, cross-dressing celebrity of the Northwestern coast.

This super-sized skillet is a replica of a usable giant pan where a woman once skated on bacon.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

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

This cemetery served as the only official burial grounds in Cambridge for nearly 200 years.

The colonial home of Paul Revere during the American Revolution.

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

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

The Boston square dedicated to the dark poet who was born nearby.

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

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

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

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

The oldest continuously inhabited private home in the United States.

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

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

A quiet memorial marks the spot where the victims of the Salem Witch Trials were executed.

The headquarters in Salem doubles as an occult art gallery.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

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

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This whimsical fountain pays tribute to Toronto's four-legged friends.