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

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

This historic Boston building has gone from personal estate to porn theater and back again.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

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

Statue commemorating the use of ether in anesthesia.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

Megachurch turned Catholic church comprised of 10,000 glass panes.

Only known mainland rookery of the threatened Stellar sea lion.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Home to the deepest rift anywhere on Earth.

A fitting attraction for the corn capital of the world.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A terrific purveyor of natural history objects and curios.

The site of the climactic scene from the classic horror film is now a historic landmark.

Every December the Wannalancit Mills lights a Christmas Tree over the old mill's smokestack.

The homestead of American patriot John Adams.

Civil War Fort on an island in the Boston Harbor.

Second largest wastewater treatment plant in the country.

A steampunk wonderland that preserves America's history of industrial innovation.

The world's largest piece of copyrighted artwork.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.